Mitsubishi Electronics Msz Fd25va User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS  
INDOOR UNIT  
No. OBH488  
SERVICE MANUAL  
Wireless type  
Models  
E1  
MSZ-FD25VA -  
E1  
MSZ-FD25VAS -  
E1  
MSZ-FD35VA -  
E1  
MSZ-FD35VAS -  
Outdoor unit service manual  
MUZ-FD·VA Series(OBH489)  
MXZ-A·VA Series (OB377)  
MXZ-8A140A (OC316)  
CONTENTS  
1. TECHNICAL CHANGES ····································3  
2. PART NAMES AND FUNCTIONS······················4  
3. SPECIFICATION·················································5  
4. NOISE CRITERIA CURVES·······························6  
5. OUTLINES AND DIMENSIONS ·························7  
6. WIRING DIAGRAM ············································7  
7. REFRIGERANT SYSTEM DIAGRAM················8  
8. SERVICE FUNCTIONS ······································9  
9. MICROPROCESSOR CONTROL ····················11  
10. TROUBLESHOOTING······································20  
11. DISASSEMBLY INSTRUCTIONS·····················36  
PARTS CATALOG (OBB488)  
NOTE:  
RoHS compliant products have <G> mark on the spec name plate.  
1
TECHNICAL CHANGES  
E1  
E1  
E1  
E1  
MSZ-FD25VA -  
MSZ-FD35VA -  
MSZ-FD25VAS -  
MSZ-FD35VAS -  
1. New model  
3
2
PART NAMES AND FUNCTIONS  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
POWER lamp  
AREA lamp  
CLEAN lamp  
PLASMA lamp  
Remote control  
receiving section  
Operation Indicator  
lamp  
Front panel  
Air filter  
Air inlet  
Remote controller  
Plasma anti-allergy  
enzyme filter  
Plasma electrode  
unit  
Plasma deodorizing  
filter  
i-see sensor  
Air outlet  
Fan guard  
Fan  
Horizontal vane  
Heat exchanger  
Emergency operation  
switch  
Vertical vane  
i-see control operation  
AREA lamp indicate AREA setting  
In AREA setting, the horizontal air flow  
direction changes automatically according  
to the detection of i-see Sensor which detects  
the floor/ wall temperature to air-condition  
the room evenly.  
i-see sensor constantly measure  
floor/wall temperature to automatically  
adjust to the set temperature by  
estimating the temperature  
actually perceived by a  
person inside the room  
("sensible temperature").  
ACCESSORIES  
Installation plate  
Installation plate fixing screw 4 o 25 mm  
1
2
3
4
5
6
7
1
5
1
2
2
1
1
Remote controller holder  
Fixing screw for 3 3.5 o 1.6 mm (Black)  
Battery (AAA) for remote controller  
Wireless remote controller  
Felt tape (Used for left or left-rear piping)  
4
3
SPECIFICATION  
Indoor model  
Power supply  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
Single phase  
230 V, 50 Hz  
Power input 1 Cooling  
26  
28  
W
Heating  
31  
33  
Running current 1 Cooling  
0.25  
0.30  
0.25  
0.30  
0.27  
0.32  
0.27  
0.32  
A
Heating  
Fan motor current 1 Cooling  
A
Heating  
Fan motor model  
RCOJ40-GF  
798O295O257  
12  
Dimensions WOHOD  
Weight  
mm  
kg  
Color  
PURE WHITE  
SILVER  
PURE WHITE  
SILVER  
Air direction  
4
Air flow  
Cooling  
Heating  
Cooling  
Heating  
Cooling  
Heating  
Cooling  
Heating  
Cooling  
Heating  
Cooling  
Heating  
672  
K/h  
K/h  
dB(A)  
dB(A)  
rpm  
(Super High)  
Air flow  
726  
750  
516/378/276  
(High/Med./Low)  
Sound level  
(Super High)  
Sound level  
(High/Med./Low)  
Fan speed  
552/402/270  
42  
552/402/282  
43  
36/29/20  
36/29/21  
1,190  
(Super High)  
Fan speed  
1,270  
1,300  
950/740/580  
rpm  
(High/Med./Low)  
1,010/780/570  
1,010/780/590  
Fan speed regulator  
4
KM08A  
Remote controller model  
NOTE : Test conditions are based on ISO 5151  
Cooling : Indoor Dry-bulb temperature 27 :  
Outdoor Dry-bulb temperature 35 :  
Wet-bulb temperature 19 :  
Heating : Indoor Dry-bulb temperature 20 :  
Outdoor Dry-bulb temperature 7 :  
Wet-bulb temperature 6 :  
Refrigerant piping length (one way): 5 m  
1 Measured under rated operating frequency.  
Specifications and rating conditions of main electric parts  
Fuse  
250 V 3.15 A  
(F11)  
(MT)  
i-see Sensor motor  
Horizontal vane motor  
Vertical vane motor  
Varistor  
MP20Z 12 VDC 300 "(at 25 ˚C)  
(MV1)  
(MV2)  
(NR11)  
(RR)  
MSFBC20C29 12 VDC 350 "(at 25 ˚C)  
MSBPC20M11 12 VDC 300 "(at 25 ˚C)  
S10K320E3K1  
i-see Sensor  
A2TPMI 23A FOV50 OBA060 P8L1 J4S  
3P  
Terminal block  
(TB)  
5
4
NOISE CRITERIA CURVES  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
FAN SPEED FUNCTION SPL(dB(A))  
LINE  
FAN SPEED FUNCTION SPL(dB(A))  
LINE  
COOLING  
HEATING  
COOLING  
HEATING  
Super High  
Super High  
42  
43  
43  
43  
90  
80  
70  
60  
50  
40  
30  
20  
10  
90  
80  
70  
60  
50  
40  
30  
20  
10  
NC-70  
NC-70  
NC-60  
NC-50  
NC-40  
NC-30  
NC-60  
NC-50  
NC-40  
NC-30  
NC-20  
NC-20  
NC-10  
NC-10  
63  
125  
250  
500  
1000 2000 4000 8000  
63  
125  
250  
500  
1000 2000 4000 8000  
BAND CENTER FREQUENCIES, Hz  
BAND CENTER FREQUENCIES, Hz  
Test conditions  
Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 :  
Heating : Dry-bulb temperature 20 :  
INDOOR UNIT  
WALL  
1 m  
0.8 m  
MICROPHONE  
6
5
OUTLINES AND DIMENSIONS  
Unit : mm  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
11  
X
20 Oblong hole  
11  
X
26 Oblong hole  
225  
225  
64  
64  
Installation plate  
798  
785  
6.5  
155  
155  
Indoor unit  
345  
330  
69  
Wall hole  
54  
[
65  
Air in  
Installation plate  
Piping  
257  
5
43  
55  
688  
55  
Drain hose  
43  
85  
97  
58  
19  
Air out  
Insulation  
Liquid line  
Gas line  
[35 O.D  
[6.35 - 0.5 m (Flared connection [6.35)  
[9.52 - 0.43 m (Flared connection [9.52)  
Insulation [28 O.D Connected part [16 O.D  
Drain hose  
6
WIRING DIAGRAM  
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS  
7
7
REFRIGERANT SYSTEM DIAGRAM  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
Unit : mm  
Refrigerant pipe [9.52  
(with heat insulator)  
Indoor coil  
thermistor  
RT12 (main)  
Indoor  
heat  
exchanger  
Flared connection  
Indoor coil  
thermistor  
RT13 (sub)  
Room temperature  
thermistor  
RT11  
Flared connection  
Refrigerant pipe [6.35  
(with heat insulator)  
Refrigerant flow in cooling  
Refrigerant flow in heating  
8
8
SERVICE FUNCTIONS  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
8-1. TIMER SHORT MODE  
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.  
The time will be shortened as follows. (Refer to 10-7.)  
Set time : 1-minute 1-second  
Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is  
shortened by short circuit of JPG and JPS.)  
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION  
A maximum of 4 indoor units with wireless remote controllers can be used in a room.  
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be  
modified according to the number of the indoor unit.  
How to modify the remote controller P.C. board  
Remove batteries before modification.  
The board has a print as shown below :  
NOTE : For modification, take out  
the batteries and press the  
OPERATE/STOP(ON/OFF)  
button twice or 3 times at  
first.  
After modification, put back  
the batteries then press  
the RESET button.  
J1  
J2  
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.  
After modification, press the RESET button.  
Table 1  
4 units operation  
Same as at left  
1 unit operation  
2 units operation  
3 units operation  
Same as at left  
Same as at left  
Solder J2  
No. 1 unit  
No. 2 unit  
No. 3 unit  
No. 4 unit  
No modification  
Same as at left  
Same as at left  
Solder J1  
Same as at left  
Solder both J1 and J2  
How to set the remote controller exclusively for particular indoor unit  
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote  
controller for the indoor unit.  
The indoor unit only accept the signal from the remote controller that has been assigned to the indoor unit once they are set.  
The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down.  
Please conduct the above setting once again after the power has restored.  
9
8-3. AUTO RESTART FUNCTION  
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed  
are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation  
in the same mode just before the shutoff of the main power.  
Operation  
1 If the main power has been cut, the operation settings remain.  
2 After the power is restored, the unit restarts automatically according to the memory.  
(However, it takes at least 3 minutes for the compressor to start running.)  
How to release “AUTO RESTART FUNCTION”  
1Turn OFF the main power for the unit.  
2Solder the Jumper wire to JR07 on the indoor electronic control  
P.C. board. (Refer to 10-7.)  
JR07  
NOTE :  
The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote  
controller.  
If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-  
celled.  
If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as the  
power button of the remote controller is OFF.  
To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the  
same time.  
When some air conditioners are connected to the same supply system, if they are operated before power failure, the  
starting current of all the compressors may flow simultaneously at restart.  
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current  
by adding to the system that allows the units to start one by one.  
8-4. REMOTE CONTROLLER  
Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed  
position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.  
Slide swich  
Area  
Left  
Center  
Right  
Position of  
the slide  
switch  
Display on  
the remote  
controller  
Where is the indoor unit installed in your room?  
Installed at left, if the  
distance is not more  
than 50 cm.  
Installed at right, if the  
distance is not more  
than 50 cm.  
(Left)  
(Center)  
(Right)  
Is the indoor unit in-  
stalled at right, left or  
center?  
NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide  
switch to the centerposition.  
10  
9
MICROPROCESSOR CONTROL  
MSZ-FD25VA  
MSZ-FD25VAS  
MSZ-FD35VA  
MSZ-FD35VAS  
WIRELESS REMOTE CONTROLLER  
Signal transmitting section  
Operation display section  
VANE CONTROL button  
OFF TIMER button  
ON TIMER button  
OPERATE/STOP  
(ON/OFF) button  
FAN SPEED CONTROL button  
OPERATION SELECT button  
ECONO COOL button  
TIME SET buttons  
FORWARD button  
BACKWARD button  
PLASMA button  
CLEAN button  
i-see button  
Temperature buttons  
WIDE VANE button  
(Vertical vane button)  
AREA button  
RESET button  
CLOCK SET button  
Indication of  
remote controller  
model is on back  
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the  
remote controller with beeps.  
INDOOR UNIT LAMP  
The lamps at the center of the indoor unit indicates the operation state.  
Lamp  
AREA  
Operation state  
Refer to 9-7.  
Lamp lights during operation.  
Lamp blinks in abnormal condition.  
POWER  
CLEAN  
Lamp lights during clean operation.  
Refer to 9-9.  
Lamp lights during PLASMA operation.  
Refer to 9-8.  
PLASMA  
11  
9-1. COOL (  
) OPERATION  
(1) Press OPERATE/STOP(ON/OFF) button.  
POWER lamp of the indoor unit turns on with a beep tone.  
(2) Select COOL mode with OPERATION SELECT button.  
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.  
The setting range is 16 ~ 31 °C.  
1. Coil frost prevention  
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil  
from frosting.  
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.  
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor  
heat exchanger rises.  
2. Low outside temperature operation  
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.  
9-2. DRY (  
) OPERATION  
(1) Press OPERATE/STOP(ON/OFF) button.  
POWER lamp of the indoor unit turns on with a beep tone.  
(2) Select DRY mode with OPERATION SELECT button.  
(3) The set temperature is determined from the initial room temperature.  
1. Coil frost prevention  
Coil frost prevention is as same as COOL mode. (9-1.1.)  
2. Low outside temperature operation  
Low outside temperature operation is as same as COOL mode. (9-1.2.)  
9-3. HEAT (  
) OPERATION  
(1) Press OPERATE/STOP(ON/OFF) button.  
POWER lamp of the indoor unit turns on with a beep tone.  
(2) Select HEAT mode with OPERATION SELECT button.  
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.  
The setting range is 16 ~ 31 °C.  
1. Cold air prevention control  
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-  
perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.  
2. High pressure protection  
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-  
densing pressure from increasing excessively.  
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.  
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor  
heat exchanger falls.  
3. Defrosting  
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.  
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.  
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.  
9-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION  
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.  
Mode selection  
(1) Initial mode  
When unit starts the operation with AUTO operation from off;  
If the room temperature is higher than the set temperature, operation starts in COOL mode.  
If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.  
(2) Mode change  
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2 °C below the  
set temperature.  
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 °C above the  
set temperature.  
NOTE 1  
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating  
in  
(AUTO), cannot change over to the other operating mode (COOL  
HEAT) and becomes a state of standby.  
Refer to NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER.  
12  
NOTE 2  
FOR MULTI SYSTEM AIR CONDITIONER  
OUTDOOR UNIT : MXZ series  
Multi system air conditioner can connect two or more indoor units with one outdoor unit.  
When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and  
the others for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor  
units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the  
same operation mode.  
Lighted  
L AREA R  
POWER CLEAN PLASMA  
Blinking  
Not lighted  
When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few  
minutes(max. 10 minutes) to blow out the warm air.  
In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flow-  
ing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.  
9-5. AUTO VANE OPERATION  
1. Horizontal vane  
(1) Vane motor drive  
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of  
the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.  
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.  
(3) Positioning  
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected  
angle.  
Confirming of standard position is performed in the following cases:  
(a) The operation starts or finishes (including timer operation).  
(b) The test run operation starts.  
(c) Standby mode (only during multi system operation) starts or finishes.  
(4) VANE AUTO (  
) mode  
The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.  
HEAT operation  
COOL and DRY operation  
Vane angle is fixed to Angle 4.  
Vane angle is fixed to Angle 1.  
1
(5) STOP (operation OFF) and ON TIMER standby  
In the following cases, the horizontal vane returns to the closed position.  
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).  
(b) When the operation is stopped by the emergency operation.  
(c) When ON TIMER is ON standby.  
(6) Dew prevention  
During COOL or DRY operation with the vane angle at Angle 3 ~ 5 when the compressor cumulative operation time  
exceeds 1 hour or 30 minutes, the vane angle automatically changes to Angle 2 for dew prevention.  
13  
(7) SWING ( ) mode  
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.  
(8) Cold air prevention in HEAT operation  
The horizontal vane position is set to Upward.  
NOTE : When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat  
off, this control doesnt work in the indoor unit.  
(9) To change the airflow direction not to blow directly onto your body.  
To change the air  
flow direction  
When to use this function?  
COOL/DRY  
HEAT  
Use this function if you dont  
want the air from the indoor  
unit to blow directly onto your  
body.  
Pressing and holding  
VANE CONTROL  
button for 2 seconds  
or more cause  
the horizontal vane  
to reverse and  
The air conditioner starts the  
cooling or drying operation  
approx. 3 minutes after the  
vane has moved to the hori-  
zontal position.  
The air conditioner starts heat-  
ing operation approx. 3 minutes  
after the vane has moved to the  
horizontal position.  
Depending on the shape of  
the room, the air may blow  
directly onto your body.  
Sometimes the area  
around your feet may not  
warm. To warm the area  
around the feet, set the  
horizontal vane to  
When VANE CONTROL  
button is pressed again,  
the vane returns to the  
previously-set position  
and the air conditioner  
starts the cool or dry  
operation in approx.  
3 minutes.  
move to horizontal  
position.  
Press VANE CONTROL  
button again to return the  
vane to the previously-set  
position.  
(AUTO) or the downward-  
blowing position.  
When VANE CONTROL  
button is pressed again,  
the vane returns to the  
previously-set position  
and the air conditioner  
starts the heat operation  
in approx. 3 minutes.  
Horizontal  
position  
NOTE :  
If you make the airflow not to blow directly onto your body by pressing VANE CONTROL button,  
the compressor stops for 3 minutes even during the operation of the air conditioner.  
The air conditioner operates with Very Low speed until the compressor turns on again.  
(10) ECONO COOL (  
) operation (ECONOmical operation)  
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 °C higher.  
Also the horizontal vane swings in various cycle.  
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air  
conditioner can keep comfort. As a result, energy can be saved.  
ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL  
button is pressed or changed to other operation mode.  
2. Vertical vane  
(1) Vane motor drive  
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of  
the motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.  
(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.  
1
4
5
2
3
(SWING)  
(3) Positioning  
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the  
selected angle.  
Confirming of standard position is performed in the following cases:  
(a) OPERATE/STOP(ON/OFF) button is pressed (POWER ON or OFF).  
(b) SWING is started.  
(c) The power supply turns ON.  
(4) SWING( ) MODE  
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally. The remote controller dis-  
plays “ ”. Swing mode is cancelled when WIDE MODE button is pressed once again.  
14  
9-6. i-see CONTROL OPERATION  
The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti-  
mating the temperature actually perceived by a person inside the room (sensory temperature).  
Advantages  
· The air inside the room is conditioned quickly to a comfortable condition.  
· The room will not become too cold or hot even when the air conditioner is kept on for a long period.  
· The air conditioner will not overcool or overheat, which means you can save on electricity.  
i-see control operation is activated when i-see button is pressed with a thin stick in manual COOL or manual HEAT mode.  
NOTE : i-see control operation is activated when the remote controller is first used following replacement of the batter-  
ies or resetting of the remote controller.  
i-see control operation is cancelled when i-see button is pressed with a thin stick once again.  
NOTE : If the conditioner is turned OFF without cancelling i-see control operation, i-see control operation is activated  
the next time the air conditioner is turned ON.  
i-see Sensor  
i-see Sensor, which is installed on the upper of the air outlet of the indoor unit, is moved with the stepping motor and it  
detects the floor/ wall temperature.  
Enlarged view of i-see Sensor  
i-see Sensor is installed here.  
i-see Sensor  
· When AREA setting is not activated, the sensing range of i-see Sensor differs depending on the installation location of  
the air conditioner.  
Installation  
position  
Installed at left  
Installed at center  
Installed at right  
Image of sensing  
range  
Direction of sensor  
Right  
Center  
Left  
Refer to "Remote controller in SERVICE FUNCTIONS".  
· Install the front panel correctly after being removed for maintenance or service so that the floor/wall temperatures can  
be measured correctly.  
9-7. AREA (  
) SETTING  
(1) Press OPERATE / STOP (ON/ OFF) button to start the air conditioner.  
(2) Press i-see button. (NOTE1)  
(3) Press AREA button.  
Each time the button is pressed, the area is changed in sequence:  
(AUTO)  
(LEFT)  
(RIGHT)  
Cancel  
i-see Sensor moves intermittently, measuring the floor and wall temperature.  
(4) AREA setting is cancelled when the "cancel" is selected by pressing AREA button, or when WIDE VANE button is pressed.  
NOTE1: AREA setting is only available during i-see control operation.  
NOTE2: If AREA setting is canceled, the vertical vane returns to the previously set position before AREA setting.  
NOTE3: The horizontal air flow direction (WIDE VANE button), including horizontal SWING, cannot be set during AREA setting.  
15  
Indoor unit installation location and air-conditioning area  
Installed at left  
Installed at center  
Installed at right  
LEFT  
RIGHT  
LEFT  
RIGHT  
LEFT  
RIGHT  
Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed  
position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.  
(Refer to "Remote controller in SERVICE FUNCTIONS".)  
·
To air-condition mainly  
To air-condition the entire room  
To air-condition mainly  
the left area of the room The horizontal air flow direction and in- the right area of the room  
door unit display are switched accord-  
ing to the room temperature (floor/wall).  
Press AREA button  
to select RIGHT.  
Press AREA button  
to select LEFT.  
Remote controller button  
Remote controller display  
Press AREA button to select AUTO.  
i-see Sensor operation  
Control range  
of horizontal air  
flow direction.  
The vertical air  
flow direction  
conforms to the  
setting on the  
remote controller.  
(The horizontal  
air flow direction  
is controlled in  
this range.)  
Installed  
at center  
Installed  
at left  
Installed  
at right  
Lighted  
Not lighted  
L
R
L
R
L
R
L
R
Indoor unit  
display  
L
R
or  
or  
AREA  
When AREA is set to AUTO  
The vertical vane is controlled to maintain uniform temperature in the whole room.  
The i-see Sensor moves in a range of 150 degrees detecting floor/wall temperature of 3 areas  
(left, right, center). Therefore, the detected temperatures may be different from the temperatures  
measured on commercial thermometers depending on the condition or temperature  
distribution on the floor and/or wall.  
Approx. 150 degrees  
Ex.) In COOL mode  
Daytime  
Nighttime  
Warm area  
Cold area  
The indoor unit delivers cold air detecting the warm area in the room.  
Indication of AREA setting  
AREA  
L
R
L
AREA  
R
Lighted  
Not lighted  
· The horizontal air flow direction changes if i-see Sensor detects approx. 3 : temperature difference.  
·
In AUTO of AREA setting, both right and left lamps are lighted when the room is evenly air-conditioned.  
L
AREA  
R
16  
Operation and operating range  
i-see sensor moves 30 degrees from the center in both right and left side.  
i-see Sensor turning to the right  
i-see Sensor turning to the left  
i-see Sensor turning to the center  
i-see Sensor operates as follows in accordance with AREA setting made with the remote controller.  
AUTOin AREA setting; first turning to the LEFT for adjusting the position then.....  
CENTER  
(The sensor turns to the right, left and center.)  
RIGHTin AREA setting; first turning to the LEFT for adjusting the position then....  
CENTER RIGHT CENTER RIGHT  
(The sensor turns to the right and center.)  
LEFTin AREA setting; first turning to the LEFT for adjusting the position then....  
CENTER LEFT CENTER LEFT  
(The sensor turns to the left and center.)  
The sensor finishes turning to one area to another for 3 seconds and it operates one area for 5 seconds.  
RIGHT  
CENTER  
LEFT  
CENTER......  
CENTER......  
CENTER......  
9-8. PLASMA (  
) OPERATION  
(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.  
(2) Press PLASMA button to set PLASMA operation.  
PLASMA lamp turns ON and plasma electrode unit is energyzed.  
(3) Press PLASMA button again to cancel PLASMA operation.  
Description of PLASMA operation:  
Plasma operation consists of deodorizing and air purifying features.  
Particles of odor-releasing substances are absorbed and decomposed by the plasma deodorizing filter.  
Particles of allergens such as pollens and house dust are collected by the plasma anti-allergy filter.  
These filters work with negative ions generated by the plasma electrode unit.  
17  
9-9. CLEAN (  
) OPERATION  
When CLEAN operation is set, it performs for 40 minutes when unit is stopped after COOL/DRY operation. CLEAN  
operation performs when: COOL is operated more than 3 minutes / DRY is operated more than 6 minutes.  
The horizontal vane is slightly opened and the fan is stopped for the first 15 minutes. then, the horizontal vane is set to  
higher than angle 1 and the fan is operaed for 25 minutes.  
9-10. TIMER OPERATION  
1. How to set the time  
(1) Check that the current time is set correctly.  
NOTE : Timer operation will not work without setting the current time. Initially 0:00blinks at the current time display of  
TIME MONITOR, so set the current time correctly with CLOCK SET button.  
How to set the current time  
(a) Press the CLOCK set button.  
(b) Press the TIME SET buttons (  
and  
) to set the current time.  
Each time FORWARD button (  
) is pressed, the set time increases by 1minute, and each time BACK  
WARD button (  
) is pressed, the set time decreases by 1minute.  
Pressing those buttons longer, the set time increases / decreases by 10 minutes.  
(c) Press the CLOCK set button.  
(2) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.  
(3) Set the time of timer.  
ON timer setting  
START  
(a) Press ON TIMER button(  
) during operation.  
(b) Set the time of the timer using TIME SET buttons (  
and  
) . w  
OFF timer setting  
STOP  
(a) Press OFF TIMER button (  
) during operation.  
(b) Set the time of the timer using TIME SET buttons (  
and  
). w  
w Each time FORWARD button (  
) is pressed, the set time increases by 10 minutes; each time BACKWARD but-  
ton (  
) is pressed, the set time decreases by 10 minutes.  
2. To release the timer  
START  
To release ON timer, press ON TIMER button (  
To release OFF timer, press OFF TIMER button(  
).  
STOP  
).  
TIMER is cancelled and the display of set time disappears.  
PROGRAM TIMER  
OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.  
• “ and “ ” display shows the order of OFF timer and ON timer operation.  
(Example 1) The current time is 8:00 PM.  
The unit turns off at 11:00 PM, and on at 6:00 AM.  
(Example 2) The current time is 11:00 AM.  
The unit turns on at 5:00 PM, and off at 9:00 PM.  
NOTE : If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-  
celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer  
cancelled when power is restored.  
18  
9-11. EMERGENCY/TEST OPERATION  
In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the  
indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the  
remote controller run down. The unit will start and AREA lamp will light.  
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High  
speed and thermostat is ON, but temperature control does not work.  
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of  
24 °C. The fan speed shifts to Med.  
All protective operations such as the coil frost prevention works even in emergency operation.  
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (  
) mode.  
Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any  
signal from the remote controller. In case of latter, normal operation will start.  
NOTE : Do not press EMERGENCY OPERATION switch during normal operation.  
EMERGENCY OPERATION switch (E.O.SW)  
Operation mode  
Set temperature  
Fan speed  
COOL  
HEAT  
24 :  
Med.  
24 :  
Med.  
Horizontal vane  
Vertical vane  
Auto  
Auto  
Straight  
Straight  
The operation mode is indicated by the AREA  
lamp as following  
AREA lamp  
L
AREA  
R
EMERGENCY  
COOL  
Lighted  
Not lighted  
EMERGENCY  
HEAT  
STOP  
NOTE:  
This is the indication of EMERGENCY OPERATION  
mode. AREA setting is not available during EMER-  
GENCY OPERATION.  
9-12. 3-MINUTE TIME DELAY OPERATION  
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect  
compressor from overload.  
19  
10  
TROUBLESHOOTING  
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS  
10-1. CAUTIONS ON TROUBLESHOOTING  
1. Before troubleshooting, check the following  
1) Check the power supply voltage.  
2) Check the indoor/outdoor connecting wire for miswiring.  
2. Take care of the following during servicing  
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after  
confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.  
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.  
3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.  
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.  
Lead wiring  
Housing point  
3. Troubleshooting procedure  
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.  
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.  
2) Before servicing, check that the connector and terminal are connected properly.  
3) When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for  
bursting and discoloration.  
4) When troubleshooting, refer to 10-2., 10-3. and 10-4.  
4. How to replace batteries  
Weak batteries may cause the remote controller malfunction.  
In this case, replace the batteries to operate the remote controller normally.  
1 Remove the front lid and insert batteries.  
2 Press RESET button with tip end of ball point pen  
Then reattach the front lid.  
or the like, and then use the remote controller.  
Insert the negative pole of the  
batteries first. Check if the polarity  
of the batteries is correct.  
RESET button  
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.  
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.  
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by  
the battery replacement.  
5. How to install the horizontal vane  
If horizontal vane is not installed correctly, all of the operation indicator lamps will blink.  
In this case, install the horizontal vane correctly by following the procedures 1 to 2.  
NOTE : Before installation of the horizontal vane, turn OFF the power supply.  
In procedure 2lock the  
stoppers until they click  
2
into place.  
Lock  
1
20  
10-2. FAILURE MODE RECALL FUNCTION  
Outline of the function  
This air conditioner can memorize the abnormal condition which has occurred once.  
Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure details  
can be recalled.  
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.  
1. Flow chart of failure mode recall function for the indoor/outdoor unit  
Operational procedure  
The cause of abnormality cannot be found because the abnormality doesn't recur.  
Setting up the failure mode recall function  
Turn ON the power supply.  
<
>
Preparation of the remote controller  
1While pressing both OPERATION SELECT button and TOO COOL button on the  
remote controller at the same time, press RESET button.  
2First, release RESET button.  
And release the other two buttons after all LCD in operation display section of the  
remote controller is displayed after 3 seconds.  
W1. Regardless of normal or abnormal condition,  
a short beep is emitted once the signal is  
received.  
Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature  
is displayed) with the remote controller headed towards the indoor unit. W1  
No  
(OFF)  
Does POWER lamp on the indoor unit blink at the  
interval of 0.5 seconds?  
Blinks: Either indoor or outdoor unit is abnormal.  
Beep is emitted at the same timing  
Indoor unit is normal.  
But the outdoor unit might be abnormal because there are some  
abnormalities that can't be recalled with this way.  
Confirm if outdoor unit is abnormal according to the detailed outdoor  
unit failure mode recall function.  
as the blinking of POWER lamp. W2  
Yes  
(Blinks)  
Judgment of indoor/outdoor abnormality  
Before blinking, does POWER lamp stay  
ON for 3 seconds?  
Yes  
Stays ON for 3 seconds (without beep):  
The outdoor unit is abnormal.  
No  
The indoor unit is abnormal.  
The outdoor unit is abnormal.  
Check the blinking pattern, and confirm the abnormal point with the indoor unit  
failure mode table(10-2.4.).  
Make sure to check at least two consecutive blinking cycles. W2  
Check the blinking pattern, and confirm the abnormal point with the  
outdoor unit failure mode table (Refer to outdoor unit service manual.)  
Make sure to check at least two consecutive blinking cycles. W3  
Releasing the failure mode recall function  
Release the failure mode recall function by the following procedures.  
Turn OFF the power supply and turn it ON again.  
Press RESET button of the remote controller.  
Repair the defective parts.  
Deleting the memorized abnormal condition  
1After repairing the unit, recall the failure mode again according to  
"Setting up the failure mode recall function" mentioned above.  
2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)  
with the remote controller headed towards the indoor unit.  
3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.  
4Release the failure mode recall function according to "Releasing the failure mode recall function"  
mentioned above.  
NOTE: 1.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.  
2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.  
W2. Blinking pattern when the indoor unit is abnormal:  
Blinking at 0.5-  
second interval  
Blinking at 0.5-  
second interval  
2.5-second OFF  
2.5-second OFF  
ON  
OFF  
Beeps  
Beeps  
Beeps  
Repeated cycle  
Repeated cycle  
Repeated cycle  
W3.Blinking pattern when the outdoor unit is abnormal:  
Blinking at 0.5-  
Blinking at 0.5-  
second interval  
2.5-second OFF  
3-second ON  
second interval  
2.5-second OFF  
3-second ON  
ON  
OFF  
No beep  
Beeps  
No beep  
Beeps  
Repeated cycle  
Repeated cycle  
Repeated cycle  
21  
2. Flow chart of PLASMA operation failure mode recall function  
Operational procedure  
The plasma electrode unit might be abnormal. Confirm if plasma electrode  
unit is abnormal according to the following procedures.  
Confirm that the remote controller is in the failure mode recall  
function.  
With the remote controller headed towards the indoor unit, press TOO COOL or TOO  
WARM button to adjust the set temperature to 23 :. W1  
W1. Regardless of normal or abnormal condition, a short  
beep is emitted as the signal is received.  
Does POWER lamp on the indoor unit blink at the  
interval of 0.5 seconds?  
No  
(OFF)  
Blinks: The plasma electrode unit is abnormal.  
Beep is emitted at the same timing as the  
blinking of POWER lamp.  
W2  
Yes  
(Blinks)  
The plasma electrode unit is abnormal.  
Check the blinking pattern, and refer to confirm the abnormal point  
with the PLASMA operation failure mode table (10-2.5.).  
The plasma electrode unit is normal.  
Make sure to check at least two consecutive blinking cycles. W2  
Releasing the failure mode recall function  
Release the failure mode recall function by the following procedures.  
Turn OFF the power supply and turn it ON again.  
Press RESET button of the remote controller.  
Release the failure mode recall function according to the left  
mentioned procedure.  
Repair the defective parts.  
Deleting the memorized abnormal condition  
1After repairing the unit, recall the failure mode again according to  
"Setting up the failure mode recall function" mentioned above.  
2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)  
with the remote controller headed towards the indoor unit.  
3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.  
4Release the failure mode recall function according to "Releasing the failure mode recall function"  
mentioned above.  
NOTE1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.  
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.  
W2.Blinking pattern when plasma unit is abnormal:  
Blinking at 0.5-  
second interval  
Blinking at 0.5-  
second interval  
2.5-second OFF  
2.5-second OFF  
ON  
OFF  
Beeps  
Beeps  
Beeps  
Repeated cycle  
Repeated cycle  
Repeated cycle  
3. PLASMA operation check  
PLASMA operation goes ON when PLASMA button on the remote controller is pressed with any set temperature displayed  
during failure mode recall function.  
PLASMA lamp  
Correspondence  
Continuously blinking  
Follow "Check of PLASMA operation" to identify the error.(Refer to 10-6.F)  
There is failure in PLASMA operation control circuit on the indoor electronic control  
2-time flash  
Not lighted  
P.C. board.(Refer to 10-6.F)  
Normal  
22  
4. Indoor unit failure mode table  
Abnormal point  
(Failure mode)  
POWER lamp  
Not lighted  
Condition  
Correspondence  
Normal  
The room temperature thermistor short  
or open circuit is detected every 8 seconds  
during operation.  
Room temperature  
thermistor  
Refer to the characteristics of the room  
temperature thermistor (10-7.).  
1-time flash  
every 0.5-second  
The indoor coil thermistor short or open  
circuit is detected every 8 seconds during  
operation.  
Refer to the characteristics of the main  
indoor coil thermistor, the sub indoor coil  
thermistor (10-7.).  
2-time flash  
2.5-second OFF  
Indoor coil thermistor  
Serial signal  
3-time flash  
2.5-second OFF  
The serial signal from outdoor unit is  
not received for 6 minutes.  
Refer to 10-6.D"How to check miswiring  
and serial signal error".  
The rotational frequency feedback signal is  
not sent out for 12-seconds after indoor fan  
motor is operated.  
Refer to 10-6.A"Check of indoor fan  
motor".  
11-time flash  
2.5-second OFF  
Indoor fan motor  
Indoor control system  
It cannot properly read data in the  
nonvolatile memory of the indoor electronic  
control P.C. board.  
Replace the indoor electronic control  
P.C. board.  
12-time flash  
2.5-second OFF  
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).  
5. PLASMA operation failure mode table  
Abnormal point  
(Failure mode)  
POWER lamp  
1-time flash  
Condition  
Correspondence  
PLASMA power supply cannot be turned  
OFF even if the PLASMA operation is turned  
OFF with the remote controller.  
Replace the indoor electronic control  
P.C.board.  
PLASMA power supply  
control  
The voltage between CN1 3(+) and 2(GND)  
on the PLASMA POWER P.C.board falls  
below 1.6 V(spark discharge judgment  
voltage).  
2-time flash  
3-time flash  
Spark discharge  
The voltage between CN1 3(+) and 2(GND)  
on the PLASMA POWER P.C.board falls by  
0.9 V below the normal voltage value (3 V).  
Refer to 10-6.F"Check of PLASMA  
operation".  
Abnormal electric  
discharge error 1  
The voltage between CN1 3(+) and 2(GND)  
on the PLASMA POWER P.C.board falls  
significantly. (0.4 V / 0.5 ms)  
Abnormal electric  
discharge error 2  
4-time flash  
5-time flash  
The voltage between CN1 3(+) and 2(GND)  
on the PLASMA POWER P.C board rises  
above the normal voltage value (3 V).  
PLASMA DEODORIZING  
NOTE1 : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).  
NOTE2 : As soon as an abnormality is detected, PLASMA operation goes OFF, therefore measuring  
instrument which records the voltage wave is required in order to perform the above mentioned voltage  
measurement.  
NOTE3 : When POWER lamp flashes 1-time or 2-time, Please perform PLASMA operation check (Refer to 10-2.3).  
23  
10-3. INSTRUCTION OF TROUBLESHOOTING  
w"Test Run operation"  
means the operation  
within 30 minutes after  
EMERGENCY OPERATION  
switch is pressed.  
If blinking of OPERATION  
INDICATOR lamp cannot  
be checked, it can be checked  
with failure mode recall function.  
Start  
Indoor unit operates.  
Outdoor unit doesn't  
operate normally.  
OPERATION  
Indoor unit  
operates.  
Outdoor unit  
doesn't  
Indoor unit  
INDICATOR  
lamp on the  
indoor unit is  
flashing on  
and off.  
doesn't receive  
the signal from  
remote controller.  
operate.  
Outdoor unit  
operates only  
in Test Run  
Indoor unit  
Outdoor unit  
doesn't  
operate  
even in  
Test Run  
operation. w  
Unit doesn't  
operate  
normal  
operation in  
COOL or  
HEAT mode.  
Indoor unit  
doesn't operate,  
when  
EMERGENCY  
OPERATION  
switch is pressed.  
PLASMA lamp 2-time flash  
cause:  
Indoor unit  
Trouble of PLASMA  
operation  
operates, when  
EMERGENCY  
OPERATION  
operation. w  
switch is pressed.  
Refer to  
"How to check  
inverter/  
Refer to  
"Check of  
R.V. coil".  
Refer to 10-6.B  
"Check of  
remote controller  
and receiver  
P.C. board".  
1. Check indoor / outdoor  
connecting wire.  
(Check if the power  
is supplied to the  
indoor unit.)  
2. Refer to 10-6.C  
"Check of indoor  
electronic control  
P.C. board and indoor  
fan motor".  
Refer to 10-6.F"Check of  
PLASMA operation".  
Check room  
temperature  
thermistor.  
Refer to 10-7.  
"Test point  
diagram and  
voltage".  
compressor".  
Refer to outdoor unit service manual.  
POWER lamp  
7-time flash  
Cause:  
Outdoor unit  
Trouble of  
outdoor  
All lamps  
POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp  
POWER lamp  
14-time flash  
Cause:  
Outdoor unit  
Other  
Flash on and off  
at 0.5-second  
intervals  
Flash on and off 2-time flash  
3-time flash  
Cause:  
Indoor unit  
Trouble of  
indoor fan  
motor  
5-time flash  
Cause:  
Outdoor unit  
Outdoor  
power  
6-time flash  
Cause:  
4-time flash  
Cause:  
Indoor unit  
Trouble of  
indoor unit  
control  
at 0.5-second  
intervals  
Cause:  
Indoor unit  
Trouble of  
room temp-  
erature/  
Outdoor unit  
Trouble of  
thermistor  
in outdoor  
unit  
Cause:  
Cause:  
Indoor unit  
The horizontal  
vane is not  
installed  
Indoor/  
abnormality  
Outdoor unit  
Miswiring  
or trouble  
of serial signal  
control  
system  
system  
indoor coil  
thermistor  
system  
abnormality  
correctly.  
Refer to 10-6.  
A"Check of  
indoor fan  
motor".  
Replace the Refer to  
indoor  
Refer to  
"How to check "Check of  
Replace the  
inverter P.C.  
board or  
Check  
Refer to 10-6. Refer to 10-6. Check room  
E "Check of D "How to  
installation of check of  
the horizontal miswiring  
temperature  
thermistor  
and indoor  
coil thermis-  
tor.  
"Flow chart of  
the detailed  
outdoor unit  
failure mode  
recall function."  
electronic  
control  
inverter/  
compressor".  
outdoor  
thermistors". the outdoor  
electronic  
vane".  
and serial  
P.C. board.  
control P.C.  
signal error  
.
Refer to 10-7.  
"Test point  
diagram and  
voltage".  
board.  
24  
10-4. TROUBLESHOOTING CHECK TABLE  
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.  
When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection  
after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR  
lamp flashing.  
Lighted  
L AREA R  
POWER CLEAN PLASMA  
Blinking  
Not lighted  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Condition  
Correspondence  
POWER lamp flashes.  
0.5-second ON  
Refer to 10-6.D"How to check  
miswiring and serial signal  
error".  
Miswiring  
or serial  
signal  
The serial signal from the outdoor unit is not  
received for 6 minutes.  
0.5-second OFF  
Indoor coil  
thermistor  
POWER lamp flashes.  
2-time flash  
Refer to 10-7.the  
The indoor coil or the room temperature  
thermistor is short or open circuit.  
characteristics of indoor coil  
thermistor, and the room  
temperature thermistor.  
2
Room  
temperature  
thermistor  
2.5-second OFF  
POWER lamp flashes.  
3-time flash  
The rotational frequency feedback signal is  
not emitted during the indoor fan operation.  
Refer to 10-6.A"Check of  
indoor fan motor".  
Indoor fan  
motor  
3
4
5
2.5-second OFF  
POWER lamp flashes.  
4-time flash  
Indoor  
control  
system  
It cannot properly read data in the nonvolatile  
memory of the indoor electronic control P.C.  
board.  
Replace the indoor electronic  
control P.C. board.  
Indoor unit  
and outdoor  
unit do not  
operate.  
2.5-second OFF  
POWER lamp flashes.  
5-time flash  
Refer to "How to check of  
inverter/compressor".  
Refer to outdoor unit service  
manual.  
It consecutively occurs 3 times that the  
compressor stops for overcurrent protection or  
start-up failure protection within 1 minute after  
start-up.  
Outdoor  
power  
system  
Check the stop valve.  
2.5-second OFF  
POWER lamp flashes.  
6-time flash  
Refer to "Check of outdoor  
thermistor".  
Refer to outdoor unit service  
manual.  
The outdoor thermistors short or open circuit  
during the compressor operation.  
Outdoor  
thermistors  
6
7
2.5-second OFF  
2.5-second OFF  
Replace the inverter P.C.  
board or the outdoor  
electronic control P.C. board.  
Refer to outdoor unit service  
manual.  
POWER lamp flashes.  
7-time flash  
Outdoor  
control  
system  
It cannot properly read data in the nonvolatile  
memory of the inverter P.C. board or the  
outdoor electronic control P.C. board.  
POWER lamp flashes.  
14-time flash  
Check the stop valve.  
Confirm the abnormality in  
detail using the failure mode  
recall function for outdoor  
unit.  
Other  
abnormality  
An abnormality other than above mentioned is  
detected.  
8
9
2.5-second OFF  
Check the blinking pattern of  
the LED on the inverter P.C.  
board or the outdoor  
electronic  
It cannot properly read data in the nonvolatile  
memory of the inverter P.C. board or the  
outdoor electronic control P.C. board.  
Outdoor unit  
does not  
operate.  
Outdoor  
control  
system  
POWER lamp lights up.  
control P.C. board.  
25  
L AREA R  
POWER CLEAN PLASMA  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Condition  
Correspondence  
All lamps flash at the same time.  
0.5-second ON  
Attachment  
of the  
horizontal  
vane  
Indoor unit  
and outdoor  
unit do not  
operate.  
Refer to 10-6.E "Check of  
installation of the horizontal  
vane".  
The electricity is not conducted to the interlock  
switch (Fan) of the horizontal vane.  
0.5-second OFF  
L AREA R  
POWER CLEAN PLASMA  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Condition  
Correspondence  
POWER lamp is lighted.  
AREA lamps flash.  
The operation mode of the each indoor unit is  
differently set to COOL (includes DRY) and  
HEAT at the same time, the operation mode of  
the indoor unit that has operated at first has the  
priority.  
Outdoor unit  
operates but  
indoor unit  
does not  
MXZ type  
Operation  
mode  
Unify the operation mode.  
Refer to outdoor unit service  
manual.  
setting  
operate.  
2.5-second OFF  
L AREA R  
POWER CLEAN PLASMA  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Condition  
Correspondence  
PLASMA lamp flashes.  
2-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
PLASMA operation can not be turned OFF  
even if the PLASMA operation is turned OFF  
with remote controller.  
Refer to 10-6.F"Check of  
PLASMA operation".  
PLASMA  
control  
2.5-second OFF  
26  
10-5. TROUBLE CRITERION OF MAIN PARTS  
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS  
Part name  
Check method and criterion  
Measure the resistance with a tester.  
Figure  
Room temperature  
thermistor(RT11)  
Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control  
P.C. board", the chart of thermistor.  
Indoor coil thermistor  
(RT12, RT13)  
Indoor fan motor(MF)  
Check 10-6. A.  
RED  
Measure the resistance between the terminals with a tester.  
ROTOR  
(Part temperature 10 ~ 30 °C)  
Horizontal vane  
motor(MV1)  
YLW  
BRN  
Color of the lead wire  
BRN-other one  
Normal  
336 "~ 364 "  
GRN  
ORN  
RED  
Measure the resistance between the terminals with a tester.  
Vertical vane  
motor(MV2)  
i-see Sensor  
motor(MT)  
ROTOR  
(Part temperature 10 ~ 30 °C)  
YLW  
BRN  
Color of the lead wire  
BRN-other one  
Normal  
282 "~ 306 "  
GRN  
ORN  
Cover the i-see Sensor with black vinyl tape. Then, turn ON the power  
supply. (i-see Sensor is energized.) Measure the voltage between  
connector terminals of i-see Sensor with a tester.  
(Part temperature 10 ~ 40 °C)  
i-see Sensor  
Cover the i-see  
Sensor with  
black vinyl tape.  
w
4
3
2(GND)  
1
i-see Sensor(RR)  
i-see Sensor P.C. board  
connector  
Black vinyl tape  
i-see Sensor  
connector terminals  
Normal range  
2(GND)  
-
4(+) 1.874 ~ 3.387 VDC  
1(+) 2(GND) 1.010 ~ 1.420 VDC  
-
NOTE: Pay attention to static electricity.  
PLASMA electrode unit  
Check 10-6. F  
27  
10-6. TROUBLESHOOTING FLOW  
POWER lamp flashes 3-time.  
Indoor fan does not operate.  
A
Check of indoor fan motor  
The indoor fan motor error has occurred, and the indoor fan doesn't operate.  
Turn OFF the power supply.  
Pay careful attention to the high voltage on  
the fan motor connector CN211.  
Turn ON the power supply, wait 5 seconds or more, and then press  
EMERGENCY OPERATION switch.  
Measure the supply voltage as follows within 12 seconds after  
EMERGENCY OPERATION switch is pressed.  
If more than 12 seconds passes by, turn OFF the power supply and  
turn ON it again, then measure the voltage. w  
Is there any foreign matter that  
interferes the rotation of the line  
flow fan?  
No  
1.Measure the voltage between CN211 1(+) and 3(-).  
2.Measure the voltage between CN211 5(+) and 3(-).  
Yes  
wIf more than 12 seconds passes after EMERGENCY OPERATION switch  
is pressed, the voltage mentioned above 2 goes 0 VDC although the  
indoor electric control P.C. board is normal.  
Remove the foreign matter and  
adjust the line flow fan.  
Is there 325 VDC between  
CN211  
CN211 1 (+) and 3 (-), and does  
the voltage between CN211 5(+)  
and 3(-) rise to the range of 3 to 6  
VDC within 12 seconds after  
Indoor electronic  
control P.C. board  
Yes  
Replace the indoor fan motor.  
EMERGENCY OPERATION switch  
is pressed?  
No  
Replace the indoor electronic control P.C. board.  
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.  
No  
Measure the voltage between CN211  
6(+) and 3(-) while the fan motor is  
rotating.  
(Changed)  
Is it unchanged holding  
0 or 15 VDC?  
Replace the indoor electronic control P.C. board.  
Yes  
(Unchanged)  
Replace the indoor fan motor.  
28  
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.  
B Check of remote controller and indoor electronic control P.C. board  
wCheck if the remote controller is exclusive for this air conditioner.  
Press OPERATE/STOP(ON/OFF) button on the remote controller.  
No  
Is LCD display on the remote con-  
Replace the batteries. (Refer to 10-1.4.)  
troller visible?  
(not clear)  
Yes  
Remove the batteries, then set them back  
and press RESET button. (Refer to 10-  
1.4.) Check if the unit operates with the  
remote controller.  
No  
Turn ON a radio to AM and press  
OPERATE/STOP(ON/OFF) button on the remote controller.  
Does the unit operate with the  
remote controller?  
Yes  
OK  
No  
Replace the remote controller.  
Is noise heard from radio?  
Yes  
Are there any fluorescent lights of  
inverter or rapid-start type within  
the range of 1 m?  
Yes  
Reinstall the unit away from lights.  
Attach a filter on receiving part.  
No  
Replace the indoor electronic  
control P.C. board.  
(including the receiver)  
29  
The unit does not operate with the remote controller.  
Also, POWER lamp does not light up by pressing EMERGENCY OPERATION switch.  
C Check of indoor P.C. board and indoor fan motor  
Turn OFF the power supply.  
Remove indoor fan motor connector CN211, vane motor  
connector CN151 and the i-see Sensor motor connector  
CN110 from the indoor electronic control P.C. board and  
turn ON the power supply.  
Short/open circuit:  
Measure the resistance of the i-see Sensor  
motor coil.  
Refer to 10-5.  
Replace the i-see Sensor motor  
and the indoor electronic control P.C.  
board.  
Yes  
Does the unit operate with the remote controller?  
Does POWER lamp light up by pressing EMERGENCY  
OPERATION switch?  
Short/open circuit:  
Replace the indoor fan motor.  
Measure the resistance between CN211 3  
and 4 of the indoor fan motor connector.  
No  
Short/open circuit:  
Measure the resistance of the horizontal vane  
motor coil and the vertical vane motor coil.  
Refer to 10-5.  
Replace the horizontal vane motor, the  
vertical vane motor and the indoor  
electronic control P.C. board.  
Replace the varistor(NR11) and fuse(F11).  
Yes  
No  
Are the varistor(NR11) burnt  
and the fuse(F11) blown?  
Turn OFF the power supply.  
Check both parts sideand pattern  
sideof the indoor electronic control P.C.  
board visually.  
Be sure to check both the fuse  
and the varistor in any case.  
No  
Is the fuse(F11) blown only?  
Yes  
Measure the resistance between  
1(+) and 3(-) of the indoor fan  
motor connector.  
w1. The fan motor connector's 1 lead wire is red, whereas 3 is black.  
w2. Connect "+" of the tester to fan motor connector's 1 lead  
wire, and "-" to 3 lead wire, otherwise the resistance cannot be  
measured properly.  
w1,w2  
No  
Is the resistance 1 M"  
or more?  
Replace the fuse (F11) and the indoor fan motor.  
Yes  
Replace the fuse (F11).  
No  
Measure the resistance of cement  
resistor(R111) on the indoor electronic  
control P.C. board.  
Is the resistance  
approx. 4 "?  
Replace the indoor electronic control P.C. board  
and the indoor fan motor.  
Yes  
Replace the indoor electronic control P.C. board.  
30  
• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.  
Indoor unit does not operate.  
• POWER lamp flashes ON and OFF every 0.5-seconds.  
Outdoor unit does not operate.  
D
How to check miswiring and serial signal error  
Turn OFF the power supply.  
Is there rated voltage  
in the power supply?  
Check the power  
supply.  
No  
No  
Yes  
Turn ON the power supply.  
Is there rated voltage between  
outdoor terminal block S1 and  
S2?  
Check the wiring.  
Yes  
Press EMERGENCY OPERATION switch once.  
Does AREA-L lamp light up?  
<Confirmation of the power to the indoor unit>  
No  
No  
Yes  
Is there any miswiring,  
poor contact, or wire  
disconnection of the  
indoor/outdoor  
Yes  
Is serial signal error indicated 6 minutes later?  
Yes  
Correct them.  
connecting wire?  
No  
A
Turn OFF the power supply.  
Check once more if the indoor/outdoor  
connecting wire is not miswiring.  
B
Short-circuit outdoor terminal block S2 and  
S3.  
W1  
W1. Miswiring may damage indoor electronic control  
P.C. board during the operation.  
Be sure to confirm the wiring is correct before the  
operation starts.  
W3. Be sure to check this within 3 minutes after turning  
ON. After 3 minutes, LED blinks 6 times. Even when  
the inverter P.C.board or the outdoor electronic control  
P.C.board is normal, LED blinks 6 times after  
3 minutes.  
Turn ON the power supply.  
(Except for outdoor unit of multi system type)  
Does the LED on the inverter P.C. board  
or the outdoor electronic control P.C.board  
repeat "3.6-second-OFF and 0.8-second-ON  
Replace the inverter P.C. board or  
the outdoor electronic control P.C.board.  
W2  
No  
(Lighted or  
not lighted)  
quick blinking"?  
W3  
W2 Be careful to the residual  
Yes  
voltage of smoothing capacitor.  
Turn OFF the power supply.  
Remove the short-circuit between  
outdoor terminal block S2 and S3.  
Turn ON the power supply.  
Is there amplitude of 10 to 20 VDC  
between outdoor terminal block S2  
and S3? <Confirmation of serial  
signal>  
Is there any error of the  
Replace the  
indoor/outdoor  
connecting wire.  
indoor/outdoor connecting wire,  
such as the damage of the wire,  
intermediate connection, poor  
contact to the terminal block?  
Yes  
No  
A
· Turn OFF inverter-controlled lighting  
equipment.  
· Turn OFF the power supply and then  
turn ON again.  
No  
Yes  
· Press EMERGENCY OPERATION  
switch.  
Is there any error of the  
Is there rated voltage between  
indoor terminal block S1 and S2?  
<Confirmation of power voltage>  
indoor/outdoor connecting wire,  
such as the damage of the wire,  
intermediate connection, poor  
contact to the terminal block?  
Replace the  
indoor/outdoor  
connecting wire.  
· Reinstall  
either the  
unit or the  
light each  
other away.  
· Attach a filter  
on remote  
control  
receiving  
section of  
the indoor  
unit.  
Yes  
No  
Yes  
No  
Is serial signal  
error indicated  
6 minutes later?  
No  
Replace the indoor electronic control P.C. board.  
Yes  
Be sure to release the failure-mode  
recall function after checking.  
B
31  
All lamps flash ON and OFF every 0.5-second.  
Indoor unit and outdoor unit do not operate.  
Check of installation of the horizontal vane  
E
Turn OFF the  
power supply.  
No  
Relock the stopper of the  
horizontal vane to the indoor unit.  
(Refer to 10-1.5.)  
Is the stopper of the horizontal vane  
locked to the indoor unit correctly?  
Yes  
Turn ON the  
power supply.  
No  
Are all lamps flashing?  
Yes  
OK  
To check the continuity of the interlock switch  
Turn OFF the  
power supply.  
(Fan), measure the resistance of connector 1 - 2  
connected to CN1R1 on the indoor electronic  
control P.C. board.  
No(  
)
Replace the  
interlock switch(Fan).  
Is there resistance 0 "?  
Yes  
Replace the  
indoor electronic  
control P.C. board.  
PLASMA lamp flashes 2-time.  
POWER lamp flashes 1 to 5 times while PLASMA operation failure mode (Refer to 10-2.5) is recalled.  
F
Check of PLASMA operation  
After performing the check, make sure to release the failure mode recall function.  
High voltage (approx. -4.4 kV) is generated during PLASMA  
operation.  
Turn ON the power supply.  
Pay careful attention and never touch PLASMA ELECTRODE  
UNIT and the high-voltage lead part (red wire).  
Yes  
Does PLASMA lamp flash  
2-time with unit stopping?  
Replace the indoor electronic control P.C. board.  
No  
1 While pressing both OPERATION SELECT button and  
TOO COOL button on the remote controller at the same time,  
press RESET button.  
2 First, release RESET button.  
And release the other two buttons after all LCD except the set  
temperature in operation display section of the remote  
controller is displayed after 3 seconds.  
3 Press OPERATE/STOP (ON/OFF) button (the set temperature  
is displayed)  
4 And press PLASMA button once with the remote controller  
headed towards the indoor unit. w1  
PLASMA operation is selected.  
PLASMA  
operation  
wThe plasma operation check mode is set.(Refer to 10-2.5.)  
w1 Regardless of normal or abnormal condition,  
a short beep is emitted once the signal  
is received.  
OFF  
Does PLASMA lamp stay OFF, or continuously  
blink?  
Normal  
w2 Turn PLASMA operation OFF and ON again.  
(For turning OFF PLASMA operation, refer to 10-2.3.)  
(If it goes normal without turning OFF and ON, PLASMA lamp doesn't go OFF.)  
Continuously blinking.  
Replace the PLASMA POWER P.C. board.  
32  
Electromagnetic noise enters into TV sets or radios  
G
No  
Is the unit earthed?  
Yes  
Earth the unit.  
Is the distance between the  
antennas and the indoor  
unit within 3 m, or is the  
distance between the  
antennas and the outdoor  
unit within 3 m?  
Extend the distance between  
the antennas and the indoor  
unit, and/or the antennas and  
the outdoor unit.  
Yes  
No  
Is the distance between the  
TV sets or radios and the  
indoor unit within 1 m, or is  
the distance between the TV  
sets or radios and the  
Extend the distance between  
the TV sets and/or radios and  
the indoor unit, or the TV sets  
or radios and the outdoor unit.  
Yes  
outdoor unit within 3 m?  
No  
Are the antennas damaged?  
Is the coaxial cable damaged?  
Is there any poor contact in  
the antenna wiring?  
Yes  
Yes  
Replace or repair the antenna.  
Replace or repair the coaxial cable.  
No  
Is the indoor/outdoor  
Extend the distance between  
the indoor/outdoor connecting  
wire of the air conditioner and  
the wiring of the antennas.  
connecting wire of the air  
conditioner and the wiring of  
the antennas close?  
No  
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on  
the electric field strength or the installation condition (combination of specific conditions such as  
antennas or wiring).  
Check the followings before asking for service.  
1.Devices affected by the electromagnetic noise  
TV sets, radios (FM/AM broadcast, shortwave)  
2.Channel, frequency, broadcast station affected by the electromagnetic noise  
3.Channel, frequency, broadcast station unaffected by the electromagnetic noise  
4.Layout of ;  
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring  
from antennas, receiver  
5.Electric field intensity of the broadcast station affected by the electromagnetic noise  
6.Presence or absence of amplifier such as booster  
7.Operation condition of air conditioner when the electromagnetic noise enters in.  
1)Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for  
the electromagnetic noise.  
2)Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button  
on the remote controller for power ON, and check for the electromagnetic noise.  
3)After a short time (3 minutes later after turning ON), the outdoor unit starts running. During  
operation, check for the electromagnetic noise.  
4)Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the  
outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for  
the electromagnetic noise.  
33  
10-7. TEST POINT DIAGRAM AND VOLTAGE  
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS  
1. Indoor electronic control P.C. board.  
Cement resistor  
(R111)  
5 VDC  
12 VDC  
Indoor fan motor  
(CN211)  
1325 VDC  
3(-) Fiducial terminal of  
cathode side on measur-  
ing high-voltage DC  
415 VDC  
5(+)3-6 VDC  
6(+)0 or 15 VDC  
Power supply input  
230 VAC  
Interlock switch(Fan)  
(CN1R1)  
Room temperature  
thermistor RT11  
(CN111)  
{
SW P.C. Board  
Emergency  
operation  
Varistor (NR11)  
switch(SW1)  
CN2011  
(Used for check of con-  
ducting of thermal fuse)  
Indoor coil thermistor  
RT12, RT13 (CN112)  
Plasma electrode unit  
(CN1T1)  
Horizontal vane(CN1U1)  
Vertical vanes(CN151)  
Timer short mode  
point JPG, JPS  
(Refer to 8-1.)  
}
Fuse  
(F11)  
i-see Sensor  
(CN110)  
(LD101)  
1-3 : Connect to the monitor P.C.board  
4-0 : Connect to the power monitor receiver  
P.C.board  
Release of Auto restart  
function  
Solder the Jumper wire  
to JR07  
(Refer to 8-3.)  
Room temperature thermistor (RT11)  
Indoor coil thermistor (RT12, RT13)  
Temperature (:)  
34  
2. Power monitor receiver P.C. board  
3. Monitor P.C. board  
4. Plasma power P.C. board  
CN1  
3DC 2.5 V during PLASMA  
DEODORIZING operation  
2GND  
1DC 12.5 V during PLASMA  
DEODORIZING operation  
35  
11  
DISASSEMBLY INSTRUCTIONS  
<"Terminal with locking mechanism" Detaching points>  
The terminal which has the locking mechanism can be detached as shown below.  
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.  
The terminal without locking mechanism can be detached by pulling it out.  
Check the shape of the terminal before detaching.  
(1) Slide the sleeve and check if there is a locking lever or not.  
(2) The terminal with this connector has the  
locking mechanism.  
Sleeve  
1Slide the sleeve.  
1Hold the sleeve, and  
2Pull the terminal while  
pushing the locking  
pull out the terminal  
slowly.  
Locking lever  
lever.  
Connector  
NOTE :  
Turn OFF power supply  
before disassembling.  
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS  
OPERATING PROCEDURE  
PHOTOS  
1. Removing the panel  
Photo 1  
(1) Press and unlock the knobs on both sides of the front  
panel and lift the front panel until it is level. Pull the hinges  
forward to remove the front panel.  
Horizontal vane  
(2) Remove the horizontal vanes.  
Front panel  
(3) Remove the screw caps of the panel. Remove the screws.  
(See Photo 1)  
(4) Hold the lower part of both ends of the panel and pull it  
slightly toward you, and then remove the panel by pushing  
it upward.  
Screws of the panel  
36  
OPERATING PROCEDURE  
PHOTOS  
2. Removing the electronic control P.C. board, the  
power monitor receiver P.C. board, i-see Sensor, SW  
P.C. board and the terminal block  
Photo 2  
(1) Remove the panel (Refer to 1.) and the corner box.  
(2) Remove the screw of the V.A. clamp. Remove the V.A.  
clamp and then the indoor/outdoor connecting wire. (See  
Photo 2)  
Screws of the  
terminal block  
cover  
(3) Remove the sensor holder from the electrical cover. (See  
Photo 3)  
(4) Remove the screw of the electrical cover, and then the  
electrical cover. (See Photo 3)  
(5) Remove the earth wire connected to the indoor electronic  
control P.C. board from the electrical box. (See Photo 3.)  
(6) Remove the power monitor receiver P.C. board holder.  
(See Photo 4.)  
(7) Pull out the i-see Sensor from the power monitor receiver  
P.C. board holder.  
Drain hose  
Screw of the V.A. clamp  
Earth wire  
( ) Install the i-see Sensor in its former position when assem-  
w
bling it.(Refer to Photo 5)  
(8) Open the rear cover of the power monitor receiver P.C.  
board holder and pull out the power monitor receiver P.C.  
board.  
Photo 3  
(9) Open the sensor holder and pull out the SW P.C. board.  
(10) Pull the electronic control P.C. board slightly toward you  
from the electrical box, and disconnect TAB3 and all the  
connectors on the electronic control P.C. board.  
(11) Pull out the electronic control P.C. board from the electrical  
box.  
Sensor holder  
(12) Remove the earth wire connected to the heat exchanger  
from the electrical box. (See Photo 3)  
(13) Unhook the catches of the electrical box, and pull out the  
electrical box.  
(14) Remove the screw of the terminal block cover, and then  
the terminal block cover and the terminal block holder.  
(See Photo 3)  
Screw of the  
electrical cover  
(15) Remove the terminal block by sliding it.  
Sensor holder (inside)  
Photo 4  
SW P.C. board  
Plasma power P.C. board holder  
Power monitor receiver  
P.C. board holder  
i-see Sensor holder  
37  
OPERATING PROCEDURE  
PHOTOS  
3. Removing the electrical box  
Photo 5  
(1) Remove the panel (Refer to 1.) and the corner box.  
(2) Remove the indoor/outdoor connecting wire, the sensor  
holder, the electrical cover and the earth wire. (Refer to  
2.)  
(3) Disconnect the following connectors on the electronic con-  
trol P.C. board;  
fan motor <CN211>, indoor coil thermistor <CN112>, vane  
motor <CN151>, interlock switch <CN1R1>, plasma power  
P.C. board <CN1T1>.  
(4) Unhook the catches of the electrical box, and pull out the  
electrical box. (See Photo 3)  
Be sure to assemble the i-see Sensor  
in the correct position  
4. Removing the nozzle assembly  
Photo 6  
(1) Remove the panel (Refer to 1.) and the corner box.  
(2) Remove the V.A. clamp, and then the indoor/outdoor con-  
necting wire. (See Photo 2)  
Interlock switch  
(3) Remove the sensor holder and the electrical cover. (See  
Photo 3.)  
(4) Disconnect the following connectors on the electronic con-  
trol P.C. board;  
vane motor <CN151>, interlock switch<CN1R1>.  
(5) Remove the power monitor receiver P.C. board holder and  
the plasma power holder P.C. board holder. (See Photo 4)  
(6) Pull out the drain hose from the nozzle assembly and  
remove the nozzle assembly.  
Screws of the interlock switch  
(7) Remove the interlock switch.  
5. Removing the vertical vane motor unit  
Photo 7  
(1) Remove the nozzle assembly. (Refer to 4.)  
(2) Remove the crank of the vertical vane motor unit from the  
arm of the vertical vane.  
Screws of the vertical vane motor unit cover  
(3) Remove the screw of the vertical vane motor unit, and pull  
the vertical vane motor unit.  
(4) Remove the screws of the vertical vane motor unit cover.  
(5) Remove the crank of the vertical vane motor unit from the  
shaft of the vane motor.  
( ) Only the crank of the left side vertical vane motor unit.  
w
(See Photo 7)  
Crank of the vertical  
vane motor unit  
Screw of the vertical  
vane motor unit  
(6) Remove the vertical vane motor from the the vertical vane  
motor unit.  
(7) Disconnect the connector of vertical vane motor from the  
vertical vane motor.  
Photo 8  
Screws of the vertical vane motor unit cover  
Screw of the vertical  
vane motor unit  
Crank of the vertical  
vane motor unit  
38  
OPERATING PROCEDURE  
PHOTOS  
6. Removing the horizontal vane motor  
(1) Remove the nozzle assembly.(Refer to 4.)  
(2) Remove the screws of the horizontal vane motor unit, and  
pull out the horizontal vane motor unit.  
Photo 9  
Screws of the horizontal  
vane motor unit cover  
(4) Remove the screws of the horizontal vane motor unit  
cover.  
(5) Remove the horizontal vane motor from the horizontal  
vane motor unit.  
(3) Disconnect the connector from the horizontal vane motor.  
Screws of the horizontal vane motor unit  
7. Removing the indoor fan motor and the line flow fan  
(1) Remove the panel (Refer to 1.) and the corner box.  
(2) Remove the sensor holder, the power monitor receiver P.C.  
board holder, the electrical box (Refer to 3.) and the nozzle  
assembly (Refer to 4.).  
Photo 10  
Motor band  
(4) Remove the screws fixing the motor bed. (See Photo 10)  
(5) Loosen the screw fixing the line flow fan. (See Photo 11)  
(6) Remove the motor bed together with fan motor and motor  
band.  
(7) Release the hooks of the motor band. Remove the motor  
band. Pull out the indoor fan motor.  
(8) Remove the indoor coil thermistor from the heat exchang-  
er.  
Screws of  
the motor bed  
( ) Install the indoor coil thermistor (RT12) in its former posi-  
w
tion when assembling it. (Refer to Photo 13)  
(9) Remove the screws fixing the left side of the heat  
exchanger. (See Photo 12)  
(10) Lift the heat exchanger, and pull out the line flow fan to the  
lower-left.  
Photo 11  
Photo 13  
Screw of  
the line flow fan  
Photo 12  
Indoor coil thermistor (RT12)  
Screws of the  
left side of the  
heat exchanger  
39  
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN  
C Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD  
New publication, effective Aug. 2007  
Specifications subject to change without notice.  
Distributed in Aug. 2007. No. OBH488 6  
Made in Japan  

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