Mitsubishi MSZ-HC25VA-E1, MSZ-HC35VA-E1, MSZ-HC35VA-E2, MSZ-HC35VAB-E1, MSZ-HC35VAB-E2 Service Manual
Page 1
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Models
Revision B:
• MSZ-HC35VA-E2 and MSZ-HC35VAB-E2
have been added.
Please void OBH466 REVISED EDITION-A.
No. OBH466
REVISED EDITION-B
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VA -
E1
E1
E2
MSZ-HC35VAB MSZ-HC35VAB -
E1
E2
Outdoor unit service manual
MUZ-HC·VA Series (OBH467)
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 ··············· 9
8. SERVICE FUNCTIONS ··································· 10
9. MICROPROCESSOR CONTROL ··················· 12
10. TROUBLESHOOTING ····································· 17
11. DISASSEMBLY INSTRUCTIONS ···················· 29
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB466)
Page 2
Revision A:
• 10. TROUBLESHOOTING has been corrected.
• Color of lead wire (indoor fan motor : sensor part) of 10-5. ”Trouble criterion of main parts” has been corrected.
• 10-6.”
Check of indoor fan motor” has been corrected. [MSZ-HC25]
Revision B:
• MSZ-HC35VA-E2 and MSZ-HC35VAB-E2 have been added.
Indoor coil thermistor (RT13) has been added.
2
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1
TECHNICAL CHANGES
MSZ-HA25VA - E1 → MSZ-HC25VA MSZ-HA35VA - E1 → MSZ-HC35VA MSZ-HA35VA - E1 → MSZ-HC35VAB -
1. Indoor fan motor has been changed. (DC AC) [MSZ-HC25]
2. Indoor heat exchanger has been changed. [MSZ-HC35]
3. Indoor electronic control P.C. board has been changed.
MSZ-HC35VA - E1 → MSZ-HC35VA MSZ-HC35VAB - E1 → MSZ-HC35VAB -
1. Wiring diagram has been changed.
E1
E1
E1
E2
E2
3
Page 4
2
PART NAMES AND FUNCTIONS
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
Air inlet
Air filter (Anti-mold)
Air outlet
Vertical vane
Horizontal vane
Remote control
receiving section
Emergency operation switch (E.O. SW)
Front panel
Remote controller
Operation Indicator
lamp
ACCESSORIES
Installation plate 1
Installation plate fi xing screw 4
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1
× 25 mm 5
4
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3
Electrical
data
Fan motor
Dimensions W × H × D mm 788×295×225
Weight kg 9
Air fl ow
Air direction 4
Sound
level
Fan
speed
Special remarks
Fan speed regulator 4
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C
Heating : Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
Refrigerant piping length (one way) : 5 m
Specifications and rating conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 VDC
Varistor
Terminal block (TB) 3P
SPECIFICATION
Indoor model MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
Function Cooling Heating Cooling Heating Cooling Heating
Power supply Single phase, 230 V, 50 Hz
Running current
Power input 1 W 40 23
Model RC4V18-BA or CA RC0J40-ED
Current 1 A 0.22
(Super High)
(High/Med./Low) 522/420/318 468/390/306 504/408/312 480/402/294 504/408/312 480/402/294
(Super High)
(High/Med./Low) 38/32/26
(Super High)
(High/Med./Low) 950/800/650 870/750/630 980/830/680 940/820/660 980/830/680 940/820/660
Remote controller model MP06B
1 Measured under rated operating frequency.
1 A 0.22
m3/h
dB(A)
rpm
(NR11)
630 546 612 552 612 552
43
1,110 980 1,140 1,050 1,140 1,050
S10K320E3K1 (ERZV14D471)
5
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4
NOISE CRITERIA CURVES
MSZ-HC25VA
90
80
70
60
50
40
30
FAN SPEED
Super High
FUNCTION
COOLING
HEATING
SPL(dB(A))
43
43
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
MSZ-HC35VA MSZ-HC35VAB
FAN SPEED
Super High
90
80
70
60
50
40
30
FUNCTION
COOLING
HEATING
SPL(dB(A))
43
43
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
NOISE
10
63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-20
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
Test conditions
Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Heating : Dry-bulb temperature 20°C
NOISE
10
63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-20
INDOOR UNIT
WALL
1m
0.8m
MICROPHONE
6
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5
OUTLINES AND DIMENSIONS
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
788
2255
58
42
57
140
295
60753 128
18
42
58
Installation plate
50
11 × 26 Oblong hole
254.5
21540.5
Indoor unit
42
Unit : mm
11 × 20 Oblong hole
5959 225 225
155 155
Air in
8
100
Air out
Insulation ø35 O.D
Liquid line ø6.35 - 0.5 m (Flared connection ø6.35)
Piping
Gas line ø9.52 - 0.43 m (Flared connection ø9.52)
Drain hose Insulation ø28 O.D Connected part ø16 O.D
119
137
320335
Installation plate
Piping
42
57
Wall hole
Drain hose
18.5
235
214
2
7459
41.5
ø65
253.5
6
WIRING DIAGRAM
MSZ-HC25VA
7
Page 8
MSZ-HC35VA-E1 MSZ-HC35VAB-
E2
MSZ-HC35VA-
MSZ-HC35VAB-
E1
E2
8
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7
REFRIGERANT SYSTEM DIAGRAM
MSZ-HC25VA MSZ-HC35VA-E1 MSZ-HC35VAB-
Refrigerant pipe ø9.52
(with heat insulator)
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
E1
Unit : mm
Flared connection
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-HC35VA-
E2
MSZ-HC35VAB-
E2
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
Refrigerant pipe ø9.52
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
9
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8
SERVICE FUNCTIONS
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
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 :
J2
J1
NOTE : For modification, take out
the batteries and press
the OPERATE/STOP (ON/
OFF) button twice or 3
times at first.
After finish modification,
put back the batteries then
press the RESET button.
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
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modifi cation Same as at left Same as at left Same as at left
No. 2 unit – Solder J1 Same as at left Same as at left
No. 3 unit – – Solder J2 Same as at left
No. 4 unit – – – 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 will 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 has turned OFF, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
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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
If the main power has been cut, the operation settings remain.
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”
Turn off the main power for the unit.
Solder the Jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 10-7.)
Indoor electronic
control P.C. board
CN10A CN111CN151 CN112
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
cancelled.
• 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.
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9
MICROPROCESSOR CONTROL
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
ON/OFF (operate/stop) button
Fan speed control button
Operation select button
Timer mode select button
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.
Temperature buttons
ECONO COOL button
Vane control button
Time set buttons
RESET button
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
• The following indication applies regardless of shape of shape of the indication.
Indication Operation state Room temperature
Lighted
Blinking
The unit is operating to
reach the set temperature
About 2°C or more away
from set temperature
Not lighted
The room temperature is
approaching the set temperature
About 1 to 2°C from set
temperature
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9-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR 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.
9-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR 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.)
9-3. HEAT ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR 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 temperature 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 condensing 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.
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9-4. 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.
AUTO
(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) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
In COOL and DRY operation
Vane angle is fixed to Horizontal position.
Horizontal
position
(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 2 ~ 4 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
(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.
1 2 3 4
SWING
In HEAT operation
Vane angle is fixed to Angle 4.
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(9) To change the airfl ow direction not to blow directly onto your body.
To change the airfl ow
direction
Pressing and holding
VANE CONTROL button
for 2 seconds or more
cause the horizontal vane
to reverse and move to
horizontal position.
Horizontal
position
When to use this
function?
Use this function if
you don’t want the air
from the indoor unit to
blow directly onto your
body.
• Depending on the
shape of the room,
the air may blow
directly onto your
body.
• Press VANE CONTROL button again
to return the vane
to the previously-set
COOL/DRY HEAT
The air conditioner starts the cooling or drying operation approx. 3
minutes after the vane has moved
to the horizontal position.
• 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.
The air conditioner starts heating
operation approx. 3 minutes after
the vane has moved to the horizontal position.
• Sometimes the area around your
feet may not warm. To warm the
area around the feet, set the horizontal vane to
(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.
position.
NOTE :
• If you make the airfl ow 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 conditio
ner 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 change to other operation mode.
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9-5. TIMER OPERATION (ON/OFF TIMER)
1. How to set the timer
(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(2) Select the timer mode by pressing the
button during operation.
Each time this button is pressed, the timer mode is changed in sequence:
(3) Set the time of the timer using the
(OFF TIMER) → (ON TIMER) → TIMER RELEASE
button.
Each time this button is pressed, the set time increase or decrease by 1 hour to 12 hours.
2. To release the timer
Press the
button until
(OFF TIMER) and (ON TIMER) are not displayed.
NOTE :
• The OFF TIMER and the ON TIMER cannot be set at the same time.
• The displayed time is the time remaining and will decrease in 1-hour increments as time passes.
9-6. 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 OPERATION INDICATOR 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 the system is in continuous operation (The thermostat 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..
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.
Operation mode COOL HEAT
Set temperature 24°C 24°C
Fan speed Med. Med.
Horizontal vane Auto Auto
The operation mode is indicated by the
Operation Indicator lamp as following
Operation Indicator lamp
EMERGENCY OPERATION switch
EMERGENCY COOL
↓
EMERGENCY HEAT
Lighted
Not lighted
↓
STOP
9-7. 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.
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10
TROUBLESHOOTING
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
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
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) If the P.C. board is supposed 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.
Remove the back lid and insert batteries.
Then reattach the back lid.
Insert the minus pole of the
batteries first. Check if the polarity
of the batteries is correct.
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.
Housing point
Press RESET button with a thin instrument, and
then use the remote controller.
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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>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, 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.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is
displayed) with the remote controller headed towards the indoor unit.
Does upper lamp of OPERATION INDICATOR
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 as the
blinking of upper lamp of OPERATION
INDICATOR lamp. 2
Judgment of indoor/outdoor abnormality
Releasing the failure mode recall function
Deleting the memorized abnormal condition
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.
2. Blinking pattern when the indoor unit is abnormal:
ON
OFF
3.Blinking pattern when the outdoor unit is abnormal:
ON
OFF
Before blinking, does upper lamp of
OPERATION INDICATOR lamp stay ON for 3
seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
The indoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the indoor unit
failure mode table. (Refer to 10-2.2)
Make sure to check at least two consecutive blinking cycles. 2
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.
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
Blinking at 0.5-
2.5-second OFF
2.5-second OFF 3-second ON
second interval
Repeated cycle Repeated cycle
Yes
(Blinks)
No
2.5-second OFF
Beeps
Blinking at 0.5second interval
No beep Beeps
Repeated cycle
Yes
Blinking at 0.5second interval
1
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnor-
No
(OFF)
Beeps
2.5-second OFF 3-second ON
malities that can't be recalled with this way.
Confi rm if outdoor unit is abnormal according to the detailed outdoor unit
failure mode recall function.
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm 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. 3
Repeated cycle
No beep Beeps
Repeated cycle
Beeps
1. Regardless of normal or abnormal condition,
a short beep is emitted once the signal is
received.
Blinking at 0.5second interval
Repeated cycle
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2. Indoor unit failure mode table
Upper lamp of OPERATION INDICA-
TOR lamp
Not lighted Normal — —
1-time fl ash every
0.5-second
2-time fl ash
2.5-second OFF
3-time fl ash
2.5-second OFF
11-time fl ash
2.5-second OFF
12-time fl ash
2.5-second OFF
Abnormal point
(Failure mode)
Room temperature
thermistor
Indoor coil
thermistor
Serial signal
Indoor fan motor
Indoor control
system
Condition Correspondence
The room temperature thermistor short or
open circuit is detected every 8 seconds during operation.
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
The serial signal from outdoor unit is not received for a maximum of 6 minutes.
The rotational frequency feedback signal is
not emit during the 12 seconds the indoor fan
operation.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Refer to the characteristics of the room temperature
thermistor (10-7.).
Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (10-7.).
Refer to 10-6. "How to check miswiring and serial
signal error".
Refer to 10-6. "Check of indoor fan motor".
Replace the indoor electronic control P.C. board.
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
19
Page 20
10-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Outdoor unit
doesn't operate.
Outdoor unit
operates only
in Test Run
operation.
Check room
temperature
thermistor.
Refer to 10-7.
"Test point
diagram and
voltage".
Outdoor
unit doesn't
operate even
in Test Run
operation.
Refer to "How
to check
inverter/compressor".
Indoor unit operates.
Outdoor unit doesn't
operate normally.
Unit doesn't
operate normal operation
in COOL or
HEAT mode.
Refer to
"Check of R.V.
coil".
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Refer to 10-6.
"Check of remote
controller and
indoor electronic
control P.C.
board".
OPERATION INDICATOR
lamp on the indoor unit is
fl ashing on and off.
Indoor unit
doesn't operate,
when EMERGENCY OPERATION switch is
pressed.
1. Check indoor/outdoor connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 10-6. "Check
of indoor P.C. board
and indoor fan motor".
If blinking of OPERATION INDICATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
"Test Run operation" means
the operation within 30 minutes
after EMERGENCY OPERATION switch is pressed.
Refer to outdoor unit service manual.
Upper lamp
Flash on and
off at 0.5-second intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Refer to
10-6.
"How
to check miswiring and
serial signal
error".
Upper lamp
2-time fl ash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Check room
temperature
thermistor
and indoor
coil thermistor. Refer to
10-7."Test
point diagram
and voltage".
Upper lamp
3-time fl ash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Refer to
10-6.
"Check of
indoor fan
motor".
Upper lamp
4-time fl ash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Replace the
indoor electronic control
P.C. board.
Upper lamp
5-time fl ash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Refer to
"How to
check
inverter/compressor".
Upper lamp
6-time fl ash
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Refer to
"Check of
outdoor thermistors".
Upper lamp
7-time fl ash
Cause:
Outdoor unit
• Trouble of
outdoor control system
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Upper lamp
14-time fl ash
Cause:
Outdoor unit
• Other abnormality
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall function."
20
Page 21
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 detected an abnormality of the following condition (the first detection after
the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.
OPERATION INDICATOR
Lighted
Blinking
Not lighted
Abnormal
No.
1
2
3
4
5
6
7
8
point
Miswiring
or serial
signal
Indoor coil
thermistor
Room temperature
thermistor
Indoor fan
motor
Indoor control system
Outdoor
power system
Outdoor
thermistors
Outdoor
control system
Other abnormality
Upper lamp fl ashes.
0.5-second ON
0.5-second OFF
Upper lamp fl ashes.
2-time fl ash
2.5-second OFF
Upper lamp fl ashes.
3-time fl ash
2.5-second OFF
Upper lamp fl ashes.
4-time fl ash
2.5-second OFF
Upper lamp fl ashes.
5-time fl ash
2.5-second OFF
Upper lamp fl ashes.
6-time fl ash
2.5-second OFF
Upper lamp fl ashes.
7-time fl ash
2.5-second OFF
Upper lamp fl ashes.
14-time fl ash
2.5-second OFF
Operation indicator lamp Symptom Condition Correspondence
Refer to 10-6.
Indoor unit and
outdoor unit do
not operate.
The serial signal from the outdoor unit is not
received for 6 minutes.
The indoor coil or the room temperature thermistor is short or open circuit.
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
It consecutively occurs 3 times that the compressor stops for overcurrent protection or
start-up failure protection within 1 minute after
start-up.
The outdoor thermistors short or open circuit
during the compressor operation.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
An abnormality other than above mentioned
is detected.
•
miswiring and serial signal error".
Refer to 10-7. the character-
•
istics of indoor coil thermistor,
and the room temperature thermistor.
Refer to 10-6. "Check of
•
indoor fan motor".
Replace the indoor electronic
•
control P.C. board.
Refer to "How to check of in-
•
verter/compressor".
Refer to outdoor unit service
manual
Check the stop valve.
•
Refer to "Check of outdoor
•
thermistor".
Refer to outdoor unit service
manual.
Replace the inverter P.C. board
•
or the outdoor electronic control P.C. board.
Refer to outdoor unit service
manual.
Check the stop valve.
•
Confi rm the abnormality in
•
detail using the failure mode
recall function for outdoor unit.
"How to check
Outdoor
9
control system
Upper lamp lights up
Outdoor unit
does not operate
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
21
Check the blinking pattern of
•
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
Page 22
10-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
Part name Check method and criterion Figure
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
MSZ-HC25
INNER FUSE
BA : 135
CA : 140
3°C CUT OFF
±
2°C CUT OFF
±
Measure the resistance with a tester.
Refer to 10-7. "Test point diagram and voltage", "2. Indoor electronic control
P.C. board", the chart of thermistor.
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Color of lead wire
Motor part
WHT - BLK 273 ~ 296 Ω 308 ~ 334 Ω
BLK - RED 295 ~ 320 Ω 295 ~ 320 Ω
Measure the voltage power ON.
Color of lead wire Normal range
BRN - YLW 4.5 ~ 5.5 V
Sensor part
BRN - GRY
Normal
RC4V18-BA RC4V18-CA
(When fan revolved one time)
0 V 5 V 0 V
(Approx.)
FUSE
BLK
BRN
MAIN
AUX.
YLW
GRY
RED
WHT
Indoor fan motor (MF)
MSZ-HC35
Check 10-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Vane motor (MV)
Color of the lead wire Normal
RED - BLK 235 ~ 255 Ω
10-6. TROUBLESHOOTING FLOW
A Check of indoor fan motor
MSZ-HC25VA
Turn OFF the power supply.
Check connector CN211 visually.
Reconnect the lead wires.
Disconnect the lead wires from connector CN211 on indoor power P.C. board.
Measure the resistance between lead wires No.1 and No.4 and then No.4 and No.7.
No
Is the resistance 0 (short circuit) or ∞ (open circuit)?
Are lead wires connected?
Yes ( 0 or )
Yes
Are soldered points of the connector
correctly soldered to indoor power
P.C. board?
Yes
Turn ON the power supply. Rotate indoor fan slowly for 1
revolution or over with a screwdriver etc. from air outlet, and
measure the voltage No.2(+) and No.1(-) on CN121.
No
(others)
No
BLK
BLK
RED
Resolder it.
ROTOR
BLK
BLK
Fuse (F11)
Replace the indoor fan motor.
Indoor terminal
P.C.board
Indoor power P.C.board
Varistor
(NR11)
CN121
CN211
22
No
Does the voltage repeat 0 and 5 VDC?
Yes
Replace the indoor power P.C. board, the indoor terminal P.C. board and the indoor electronic control P.C.
board.
Page 23
MSZ-HC35VA MSZ-HC35VAB
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
Turn OFF the power supply.
Is there any foreign matter that interferes
the rotation of the line fl ow fan?
Yes
Remove the foreign matter and
adjust the line fl ow fan.
Is there 325 VDC
between CN211
and (–) ?
Replace the indoor power
P.C. board and the indoor
terminal P.C. board.
(+)
No
Yes
No
Yes
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.
<Indoor power P.C. board>
1. Measure the voltage between CN211 (+) and (–).
2. Measure the voltage between CN211 (+) and (–).
<Indoor electronic control P.C. board>
1. Measure the voltage between CN10A (+) and JPG(GND)(–).
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage mentioned above 2 goes 0 VDC although the
indoor P.C. board is normal
Does the voltage between CN211
(+) and (–) on the power P.C. board
rise to the range of 2 to 6 VDC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
No
Does the voltage between CN10A
(+) and JPG (GND)(–) on the indoor
electronic control P.C. board fall to
2 V or less within 12 seconds after
EMERGENCY OPERATION switch is
pressed?
Yes
No
Replace the indoor fan motor.
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.
Measure the voltage between CN211
(+) and (–) while the fan is
rotating.
Replace the indoor power P.C.
board and the indoor terminal P.C.
board.
Indoor electronic
control P.C. board
JPG (GND)
CN10A
Yes
(Unchanged)
Fuse (F11)
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
Replace the indoor fan motor.
Is it unchanged holding
0 or 15 VDC?
Indoor terminal
P.C.board
Indoor power P.C.board
Varistor
(NR11)
No
(Changed)
No
(Changed)
Measure the voltage CN10A (+)
and JPG (GND)(–) on the indoor
electronic control P.C board when
the fan is rotating.
Replace the indoor
electronic control P.C.
board.
CN211
23
Page 24
B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller
visible?
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.
Does the unit operate with the remote
controller?
Yes
OK
No
(Not clear)
No
Replace the batteries. (Refer to 10-1.4.)
Turn ON a radio to AM and press OPERATE/STOP (ON/OFF) button on the
remote controller.
Is noise heard from radio?
Yes
Are there any fl uorescent lights of
inverter or rapid-start type within the
range of 1 m?
No
Replace the indoor electronic control
P.C. board. (Including the receiver)
No
Yes
Replace the remote controller.
Reinstall the unit away from lights.
•
Attach a fi lter on receiving part.
•
24
Page 25
C Check of indoor P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211
from indoor power P.C. board and vane
motor connector CN151 from the indoor
electronic control P.C. board and turn ON
the power supply.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
No
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor terminal P.C.
board visually.
HC25
Measure the resistance of indoor fan
motor. Refer to 10-5.
Is the resistance
normal?
No
Yes
Replace the fuse (F11)
and the indoor fan motor.
3
Replace the fuse (F11).
3
Measure the resistance of indoor fan
motor. Refer to 10-5.
Measure the resistance of the vane
motor coil. Refer to 10-5.
Yes
Measure the resistance between
CN211
motor connector. 1, 2
No
Replace the varistor (NR11)
and fuse (F11). 3
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
(+) and (-) of indoor fan
Is the resistance 1MΩ
or more?
Yes
Yes
Yes
HC35
Short circuit :
Replace the indoor fan motor.
Short circuit :
Replace the vane motor and the indoor
electronic control P.C. board.
No
No
1. The fan motor connector's lead
wire is red, whereas is black.
2. Connect "+" of the tester to fan
motor connector's lead wire, and
“–” to lead wire, otherwise the
resistance cannot be measured
properly.
3. Please replace the fuse after
removing the indoor terminal P.C.
board from the electrical box.
Fuse (F11)
Indoor terminal
P.C.board
Measure the resistance of the resistor (R111) on the indoor power P.C.
board.
Indoor electronic
control P.C.board
Indoor power P.C.board
Varistor
(NR11)
JPG (GND)
CN10A
12 VDC
5 VDC
R111
CN211
(HC35)
CN211
(HC25)
Is the resistance approx.
4 Ω?
No
Yes
Is the approx. 5 VDC between 5 V
(+) and JPG (GND) (-) of the indoor
electronic control P.C. board? Is there
approx. 9 to 13 VDC between 12 V
(+) and JPG (GND) (-) of the indoor
electronic control P.C. board.
No
Are connector CN10A on the
indoor electronic control P.C.
board or lead wires disconnected?
Yes
No
Replace the indoor power P.C. board and the
indoor terminal P.C. board.
25
Replace the indoor power P.C. board,
terminal P.C. board and the indoor fan
motor.
Replace the indoor fan motor.
Yes
Connect the connector or repair disconnection.
Page 26
D How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Press EMERGENCY OPERATION switch once.
Does the upper lamp of OPERATION INDICATOR lamp light up? <Confi rmation of the power
to the indoor unit>
Is serial signal error indicated 6 minutes later?
Turn OFF the power supply.
Check once more if the indoor/outdoor
B
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
Turn ON the power supply.
Yes
Yes
Yes
A
No
No
Check the power supply.
Check the wiring.
No
Is there any miswiring,
poor contact, or wire
disconnection of the
No
indoor/outdoor connecting wire?
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confi rm the wiring is correct before the opera-
tion starts.
3. 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.
No
Yes
Correct them.
A
Turn OFF inverter-controlled lighting
•
equipment.
Turn OFF the power supply and then
•
turn ON again.
Press EMERGENCY OPERATION
•
switch.
Reinstall
•
either the unit
or the light
each other
No
•
away.
Attach a fi lter
on remote
control receiving section
of the indoor
unit.
Is serial signal
error indicated 6
minutes later?
Yes
B
Replace the indoor power
P.C. board and the indoor
terminal P.C. board
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-secondON quick blinking"? 3
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 indoor terminal block S2 and
S3? <Confi rmation of serial signal>
Is there rated voltage between indoor
terminal block S1 and S2?
<Confi rmation of power voltage>
Is there 2 VDC or less between CN10A (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
Replace the indoor power P.C. board
and the indoor terminal P.C. board
Be sure to release the failure-mode recall function after checking.
Yes
Yes
Yes
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
No Yes No
No
(Lighted
or not
lighted)
No
Replace the indoor electronic control P.C. board.
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
2. Be careful to the residual
voltage of smoothing capacitor.
Yes
No
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
Replace the
indoor/outdoor
connecting wire.
Yes
26
Page 27
E Electromagnetic noise enters into TV sets or radios
Is the unit earthed?
Yes
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?
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 outdoor unit within 3 m?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
No
No
Yes
Yes
Yes
Yes
Earth the unit.
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Replace or repair the antenna.
Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength
or the installation condition (combination of specifi c conditions such as antennas or wiring).
Check the following 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 fi eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifi er 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.
27
Page 28
10-7. TEST POINT DIAGRAM AND VOLTAGE
1. Indoor power P.C. board, Indoor terminal P.C. board
MSZ-HC25VA
Indoor terminal P.C. board Indoor power P.C. board
Fuse (F11)( )
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
Varistor (NR11)
5 VDC
12 VDC
Resistor (R111)
CN121
GND
MSZ-HC35VA MSZ-HC35VAB
Indoor fan motor
(CN211)
}
230V AC
Indoor terminal P.C. board Indoor power P.C. board
Fuse (F11)( )
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
Varistor (NR11)
5 VDC
Resistor (R111)
12 VDC GND
Indoor fan motor
(CN211)
325 VDC
(–) GND (high-
voltage DC)
15 VDC
(+)3-6 VDC
(+)0-6 V
28
Page 29
2. Indoor electronic control P.C. board
Timer short mode
point JPG JPS
(Refer to 8-1.)
Room temperature thermistor RT11 (CN111)
Indoor coil thermistor RT12, RT13 (CN112)
GND
Vane motor (CN151)
Connector to
Indoor power P.C. board
(CN10A)
12V DC
Emergency operation
switch (E.O. SW) (SW1)
11
DISASSEMBLY INSTRUCTIONS
Release of Auto restart function
Solder the Jumper wire to JR07
(Refer to 8-3.)
5V DC
<"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.
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Resistance (kΩ)
Temperature (°C)
(1) Slide the sleeve and check if there is a locking lever or not.
Sleeve
Slide the sleeve.
Pull the terminal while
Locking lever
pushing the locking
lever.
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
OPERATING PROCEDURE PHOTOS
1. Removing the panel
(1) Remove the screw caps of the panel. Remove the
screws.
(2)
Hold the lower ends part of the panel and pull it slightly
toward you, and then remove the panel by pushing it
upward.
(2) The terminal with this connector has the
locking mechanism.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
Photo 1
Screws of the panel
29
Page 30
OPERATING PROCEDURE PHOTOS
2. Removing the indoor electronic control P.C.
board and the room temperature thermistor
(1) Turn the breaker OFF.
(2) Remove the panel (refer to 1.) and the corner box.
(3) Open the indoor electronic control P.C. board holder
(to right side), and disconnect connectors of the indoor
coil thermistor (CN112), vane motor (CN151), and
connector (CN10A) to the indoor power P.C. board on
the indoor electronic control P.C. board.
(4) Unhook the catches of the indoor electronic control P.C.
board holder from the nozzle and the electrical box
(right side).
(5) Remove the room temperature thermistor from the
hook of the indoor electronic control P.C. board holder.
(6) Open the back side of the indoor electronic control P.C.
board holder, and remove the indoor electronic control
P.C. board.
(7) Remove the room temperature thermistor from the
indoor electronic control P.C. board.
Photo 2
Catch of indoor electronic
control P.C. board holder
Electrical box
Screw of the
electrical cover
V.A. clamp
Indoor coil
thermistor
Indoor electronic control
P.C. board holder
3. Removing the indoor power P.C. board, the indoor
terminal P.C. board, and the electrical box
(1) Turn the breaker OFF.
(2) Remove the panel (refer to 1.) and the corner box.
(3) Remove the screw of V.A. clamp, and then the indoor/
outdoor connecting wire.
(4) Remove the earth wire connected to the indoor heat
exchanger from the electrical box.
(5) Unhook first the lower, then the upper catches of the
electrical box, and pull out the electrical box.
(6) Remove the screw of the electrical cover and remove
the electrical cover.
(7) Disconnect all the connectors on the indoor power P.C.
board and unhook all lead wires.
(8) Remove the screw of terminal block on the indoor ter-
minal P.C. board.
(9) Remove the indoor power P.C. board and the indoor
terminal P.C. board.
Photo 3
Catch of indoor electronic
control P.C. board holder
Lower catch
Photo:MSZ-HC35
Terminal block
Indoor terminal
P.C. board
Indoor power
P.C. board
Upper catch
30
Page 31
OPERATING PROCEDURE PHOTOS
4. Removing the vane motor
(1) Turn the breaker OFF.
(2) Remove the panel (refer to 1.) and the corner box.
(3) Remove the indoor electronic control P.C. board hold-
er (refer to 2.).
(4) Remove the screws of vane motor and remove the
vane motor.
(5) Disconnect the connector from vane motor.
5. Removing the indoor fan motor, the indoor coil thermistor, and the line flow fan
(1) Remove the panel (refer to 1.) and the corner box.
(2)
Remove the indoor electronic control P.C. board holder (refer
to 2.) and the electrical box (refer to 3.).
(3)
Remove
(4) Loosen the screw fixing the line flow fan.
(5) Remove the screws fixing the motor bed. Lift the right
(6) Remove the indoor coil thermistor from the heat
( ) MSZ-HC35VA(B)-
(7) Remove the screws fixing the left side of the heat
(8) Lift the left side of the heat exchanger, and pull out the
the drain hose from the nozzle assembly, and
remove the nozzle assembly.
side of motor bed a little, and pull right to remove the
fan motor together with motor band/bed.
exchanger
E2
Install the indoor coil thermistor in its former position
when assembling it. (Photo 7)
exchanger.
line flow fan to the lower-left.
Photo 4
Screws of the vane motor
Photo 5
Screws of the line flow fan
Photo 6
Photo 7
Indoor coil
thermistor (main)
RT12
Indoor coil
thermistor (sub)
RT13
Screws of the motor bed
31
Page 32
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Aug. 2008. No. OBH466 REVISED EDITION-B 6
Distributed in Feb. 2007. No. OBH466 REVISED EDITION-A 6
Distributed in Jan. 2007. No. OBH466 6
Made in Japan
New publication, effective Aug. 2008
Specifications subject to change without notice.
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