Mitsubishi MS-C08VC-F1, MS-C10VC-F1, MS-C13VC-F1 Service Manual

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SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

No. OBH536

MS-C08VC MS-C10VC MS-C13VC -

Outdoor unit service manual

MU-C·VC Series (OBH537)

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS ····················· 2

3. SPECIFICATION ················································ 3

4. OUTLINES AND DIMENSIONS ························ 3

5. WIRING DIAGRAM ············································ 4

6. REFRIGERANT SYSTEM DIAGRAM ··············· 4

7. SERVICE FUNCTIONS ····································· 5

8. MICROPROCESSOR CONTROL ····················· 7

9. TROUBLESHOOTING ····································· 12

10. DISASSEMBLY INSTRUCTIONS ···················· 21

PARTS CATALOG (OBB536)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

TECHNICAL CHANGES

MS-C08VC MS-C10VC MS-C13VC -

1. New model

F1 F1 F1

PART NAMES AND FUNCTIONS

MS-C08VC MS-C10VC MS-C13VC

Panel

Air outlet

Vertical vane

Air cleaning filter (Option) (Anti-Allergy Enzyme Filter, Blue bellows type)

Heat exchanger

Air inlet Front panel

Catechin air filter

Remote controller

Horizontal vane

Display section

Remote control receiving section

Emergency operation switch (E.O. SW)

ACCESSORIES

Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3.5 x 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping)

Operation Indicator lamp

1 5 1 2 2 1 1

SPECIFICATION

Indoor model Function

Power supply

Breaker capacity Running current Power input

Electrical

data

Model Fan motor current

Fan

motor Dimensions W Weight

H D

A A

MS-C08VC MS-C10VC MS-C13VC

Cooling

Single phase

220-230-240 V, 50 Hz

0.22

RC4V18-BA

0.22

788

295 225

Air direction

Air flow (High/Med./Low) Sound level (High/Med./Low) Fan speed (High/Med./Low)

Special

remarks

rpm

558/420/288

39/32/26

1,000/800/600

618/456/288

40/33/26

1,090/850/600

Fan speed regulator

Remote controller model

MP07A

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 Wet-bulb temperature 24 °C Indoor outdoor piping length : 5 m

9 4

624/480/330

42/36/29

1,100/880/660

OUTLINES AND DIMENSIONS

MS-C08VC MS-C10VC MS-C13VC

2255

140

17.5

295

788

60753 128

Installation plate

Indoor unit

11X26 Oblong hole

254.5

21540.5

Insulation

Liquid line

Gas line

Piping Drain hose

Unit : mm

11X20 Oblong hole

5959 225 225

214

155 155

320335

Air in

Installation plate

Piping

100

Air out

Φ35 O.D Φ6.35 - 0.5m (Flared connection Φ6.35)

MS-C08/C10VCΦ9.52 - 0.43m (Flared connection Φ9.52) MS-C13VCΦ12.7- 0.43m (Flared connection Φ12.7) InsulationΦ28 Connected part Φ16 O.D

119 137

7459

Wall hole

Drain hose

41.5 Φ65

18.5

235

253.5

WIRING DIAGRAM

MS-C08VC MS-C10VC MS-C13VC

REFRIGERANT SYSTEM DIAGRAM

MS-C08VC MS-C10VC MS-C13VC

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT12

Unit : mm

Refrigerant pipe Φ9.52 (MS-C08/C10VC) Φ12.7 (MS-C13VC) (with heat insulator)

Flared connection

Refrigerant pipe Φ6.35 (with heat insulator)

Refrigerant flow in cooling

SERVICE FUNCTIONS

MS-C08VC MS-C10VC MS-C13VC

7-1. 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 9-7.)

Set time : 1-minute → 1-second Set time : 3-minute

shortened by short circuit-of JPG and JPS.)

7-2. 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 :

→ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is

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.

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 Same as at left Same as at left

Solder both J1 and J2

No. 1 unit No. 2 unit No. 3 unit No. 4 unit

1 unit operation No modification

– – –

2 units operation

Same as at left

Solder J1

– –

3 units operation

Same as at left Same as at left

Solder 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.

7-3. 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. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically.

Operation

When the main power is cut off, 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 9-7.)

MS-C08/C10/C13VC

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.

MICROPROCESSOR CONTROL

MS-C08VC MS-C10VC MS-C13VC

WIRELESS REMOTE CONTROLLER

Signal transmitting section

Operation display section

OPERATE/STOP (ON/OFF) button

ECONO COOL button

POWERFUL COOL 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.

INDOOR UNIT DISPLAY SECTION

Operation Indicator lamp

The operation indicator at the right side of the indoor unit indicates the operation state.

Operation Indicator

Lighted Not lighted

Indication

Operation state

This shows that the air conditioner is operating to reach the target temperature. Please wait until the target temperature is obtained.

TEMPERATURE buttons

FAN SPEED CONTROL button

VANE CONTROL button

TIME SET button

RESET button

Difference between target temperature and room temperature

Approx. 2°C or more

This shows that the room temperature is approaching the target temperature.

Approx. 2°C or less

8-1. 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) Set TEMPERATURE buttons. Press TOO WARM or TOO COOL button to select the desired temperature. The setting range is 16 ~ 31°C.

1. Coil frost prevention

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.

8-2. 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 temperature.

1. Coil frost prevention

• The operation is the same as coil frost prevention during COOL mode.

8-3. FAN (

)OPERATION

(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select FAN mode with OPERATION SELECT button.

(3) Select the desired fan speed. When AUTO, it becomes Low. Only indoor fan operates. Outdoor unit does not operate.

8-4. “I FEEL CONTROL” (

(1) Press OPERATE/STOP(ON/OFF) button on the remote controller.

) OPERATION

Initial room temperature

Mode

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select “I FEEL CONTROL”(

) mode with the OPERATION SELECT button. (3) The operation mode is determined by the initial room

25°C or more

more than 13°C,

less than 25°C

COOL mode of

“I FEEL CONTROL”

DRY mode of

“I FEEL CONTROL”

temperature at start-up of the operation.

• Once the mode is fixed, the mode is not changed by room temperature afterwards.

• Under ON-TIMER (

When the system is stopped by the remote controller and restarted within 2 hours in “I FEEL CONTROL”

) operation, the mode is determined as follows:

( ) mode, the

system operates in previous mode automatically regardless of the room temperature.

Operation time chart Example

Previous operation

COOL mode of “I FEEL CONTROL” or COOL mode

Restart

COOL mode of “I FEEL CONTROL”

When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at

start-up of the operation.

Operation time chart Example

Previous operation

COOL mode of “I FEEL CONTROL” or COOL mode

Restart

COOL or DRY mode of “

I FEEL CONTROL” determined temperature at start-up of the operation.

that

by room

(4) The initial set temperature is decided by the initial room temperature.

Mode

Initial room temperature

Initial set temperature

26°C or more 24°C

COOL mode of

“I FEEL CONTROL”

Initial room temperature

minus 2

°C

Initial room temperature minus 2

°C

DRY mode of

“I FEEL CONTROL”

25°C to 26°C

more than13°C, less than 25°C

1 When the system is restarted with the remote controller, the system operates with the previous set temperature

regardless of the room temperature at restart. The set temperature is calculated by the previous set temperature.

(5) TEMPERATURE buttons

In “I FEEL CONTROL” mode, set temperature is decided by the microprocessor based on the room temperature. In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm. Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.

• Fuzzy control When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat or cold. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode. In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.

TOO

COOL

…

To raise the set temperature 1 ~ 2 degrees (°C)

TOO

WARM

…

To lower the set temperature 1 ~ 2 degrees (°C)

8-5. 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, which are approximately 12V and transmitted from microprocessor.

(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.

AUTO SWING

(3) Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in case of follows. (a) When the operation starts or finishes (including timer operation). (b) When the test run starts.

1234

(4) VANE AUTO (

) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room-temperature distribution.

Vane angle is fixed to Horizontal position.

Horizontal position

(5) STOP (operation OFF) and ON-TIMER standby When the following cases occur, 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 the ON-TIMER is on standby. (6) Dew prevention During COOL or DRY operation at Vane Angle 2 ~ 4 when the cumulative operation time of compressor 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. The remote controller displays “

”. SWING mode is cancelled when VANE CONTROL button is pressed once again.

(8) ECONO COOL (

) operation When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher. Also the horizontal vane swings in a 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, VANE CONTROL button or POWERFUL COOL but-

ton is pressed or change to other operation mode.

NOTE : ECONO COOL operation does not work in COOL mode of “I FEEL CONTROL”.

(9) POWERFUL COOL (

) mode

When POWERFUL COOL button is pressed in COOL mode, the fan speed and the set temperature are automatically

adjusted. Operation becomes POWERFUL COOL mode. POWERFUL COOL mode is automatically released 15 minutes after operation starts, and the operation mode returns to

the mode prior to POWERFUL COOL operation. POWERFUL COOL mode is also cancelled when POWERFUL COOL button is pressed once again, OPERATE/STOP

(ON/OFF) button is pressed, FAN SPEED CONTROL button is pressed, ECONO COOL button is pressed in COOL

mode, ON-TIMER is set or change to other operation mode.

NOTE: 1. TEMPERATURE buttons are not available during POWERFUL COOL operation.

2. VANE CONTROL button is available.

(10) To change the airflow direction not to blow directly onto your body.

To change the air

flow direction

Pressing and holding VANE CONTROL button for 2 seconds or more causes 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 position.

COOL/DRY/FAN

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 cooling or drying operation in approx. 3 minutes.

NOTE: 1. 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.

2. The air conditioner operates with decreased airflow until the compressor turns on again.

8-6. TIMER OPERATION

1. How to set the timer

(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Press TIMER MODE SELECT button “ Each time this button is pressed, the timer mode is changed in sequence. (3) Press TIME SET button (

”(OFF TIMER) → “

TIME

) to set the timer.

SELECT

(

) to select the operation.

”(ON TIMER) → TIMER RELEASE

Each time this button is pressed, the set time increases by 1 hour to 12 hours.

NOTE: 1. Be sure to place the remote controller at the position where its signal can reach the air conditioner even during TIMER operation.

2. Reset the timer in the following cases, or the set time may deviate and other malfunctions may occur.

• A power failure occurs.

• The circuit breaker functions.

3. The OFF TIMER and ON TIMER can not be set at the same time.

(Example 1) Setting to stop the air conditioner 3 hours later.

(Example 2) Setting to operate the air conditioner 7 hours later. Press “

2. Cancel

Press “

Press “ ” button to select “ ”

(OFF TIMER).

Press “ ” button to set the “3h”.

” button to select “ ” (ON TIMER).

Press “ ” button to set the “7h”.

” button until “” (OFF TIMER) and “” (ON TIMER) are not displayed.

8-7. EMERGENCY/TEST OPERATION

In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of 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. Indoor fan runs at High speed and the unit continues to operate with the thermostat on. After 30 minutes of test run operation, the system shifts to EMERGENCY COOL MODE with a set temperature of 24°C. The fan speed shifts to Med. The coil frost prevention works even in emergency operation. In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( Emergency operation continues until EMERGENCY OPERATION switch is pressed again 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 INDICATOR lamp

Press once <Cool>

EMERGENCY OPERATION switch

Press again <Stop>

) mode.

Lighted Not lighted

8-8. 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.

TROUBLESHOOTING

MS-C08VC MS-C10VC MS-C13VC

9-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn off the 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) When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.

4) Refer to 9-2, 9-3 and 9-4.

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 negative 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 instrument, and then use

the remote controller.

RESET button

9-2. FAILURE MODE RECALL FUNCTION

Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though OPERATION INDICATOR lamp indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.

1. Flow chart of failure mode recall function for the indoor unit

Operational procedure

The cause of abnormality cannot be found because the abnormality does not recur.

Setting up the failure mode recall function

Turn on the power supply. <

Preparation of the remote controller 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 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. 1

Does the upper or left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Indoor unit is abnormal. Beeps are emitted at the same timing as the blinking of the upper or left lamp of OPERATION INDICATOR lamp. 2

Yes

(Blinks)

(OFF)

1. Regardless of normal or abnormal, a short beep is emitted once the signal is received.

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that cannot be recalled with this way.

The indoor unit is abnormal.

Check the blinking pattern, and confirm the abnormal point with the indoor unit

failure mode table(9-2.2.).

Make sure to check at least two consecutive blinking cycles. 2

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

1 After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.

2 Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit.

3 Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4 Release 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 is 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: Blinking at 0.5-

second interval

Beeps

Repeated cycle

OFF

Blinking at 0.5-

2.5-second OFF

Repeated cycle Repeated cycle

second interval

Beeps

2.5-second OFF

2. Indoor unit failure mode table

Left lamp of OPERATION

INDICATOR lamp

Not lighted –Normal –

1-time flash every 0.5-second

2-time flash

2.5-second OFF

11-time flash

2.5-second OFF

12-time flash

2.5-second OFF

Abnormal point

(Failure mode)

Room temperature thermistor

Indoor coil thermistor

Indoor fan motor

Indoor control system

Detection method

When the room temperature thermistor short or open circuit is detected every 8 seconds during operation.

When the indoor coil thermistor short or open circuit is detected every 8 seconds during operation.

When the rotational frequency feedback signal is not emitted during the 12-seconds the indoor fan operation.

When it cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.

Correspondence

Refer to the characteristics of the room temperature thermistor (9-7.).

Refer to the characteristics of the indoor coil thermistor (9-7.).

Refer to 9-6. motor".

Replace the indoor electronic control P.C. board.

"Check of indoor fan

NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (9-4.).

9-3. INSTRUCTION OF TROUBLESHOOTING

Start

Indoor unit operates. Outdoor unit does not operate.

Outdoor unit operates in only Test Run operation.

Check room temperature thermistor. Refer to 9-7. "Test point diagram and voltage".

Outdoor unit does not operate even in Test Run operation.

Check of wiring diagram of outdoor unit.

Indoor and outdoor unit do not operate.

Check outdoor fuse (F or F1) and compressor contactor (52C)

Indoor unit does not receive the signal from remote controller.

Indoor unit operates, when the EMERGENCY OPERATION switch is pressed.

Refer to "Check of remote controller and receiver P.C. board".

Indoor unit does not operate, when the EMERGENCY OPERATION switch is pressed.

1. Check indoor/outdoor connecting wire. (Check if the power is supplied to the indoor unit.)

2. Check outdoor F or F1

fuse (

3. Refer to 9-6.

"Check of indoor electronic control P.C. board and indoor fan motor".

OPERATION INDICATOR lamp on the indoor unit is flashing on and off.

Upper or left lamp 2-time flash Cause: Indoor unit

• Trouble of room temperature/ indoor coil thermistor

Check room temperature thermistor and indoor coil thermistor. Refer to 9-7. "Test point diagram and voltage".

Upper or left lamp 3-time flash Cause: Indoor unit

• Trouble of indoor fan motor

Refer to

9-6. "Check of indoor fan motor".

Upper or left lamp 4-time flash Cause: Indoor unit

• Trouble of indoor control system

Replace the indoor electronic control P.C. board.

"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.

Refer to outdoor unit service manual.

9-4. 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 is turned on), the indoor electronic control P.C. board turns off the indoor fan motor with OPERATION INDICATOR lamp flashing.

OPERATION INDICATOR

Lighted Blinking

Not lighted

Abnormal

No.

point

SymptomOperation indicator lamp

Condition

Correspondence

Indoor coil thermistor

Room temperature thermistor

Indoor fan motor

Indoor control

system

Upper or left lamp flashes. 2-time flash

2.5-second OFF Upper or left lamp flashes.

3-time flash

2.5-second OFF

Upper or left lamp flashes. 4-time flash

2.5-second OFF

9-5. TROUBLE CRITERION OF MAIN PARTS

MS-C08VC MS-C10VC MS-C13VC

Part name FigureCheck method and criterion

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12)

Measure the resistance with a tester. (Part temperature 10°C ~ 30°C)

Refer to 9-7."Test point diagram and voltage", "Indoor electronic control P.C. board", for the chart of thermistor.

Measure the resistance with a tester. (Part temperature 10°C ~ 30°C)

Indoor unit and outdoor unit do not operate.

When the indoor coil or the room temperature thermistor is short or open circuit.

When the rotational frequency feedback signal is not emitted during the indoor fan operation.

When it cannot properly read data in the nonvolatile memory of the indoor electronic

• Refer to the characteristics of the indoor coil thermistor, and the room temperature thermistor (9-7).

• Refer to 9-6. indoor fan motor".

• Replace the indoor electronic control P.C. board.

"Check of

Indoor fan motor (MF)

INNER FUSE 145 ± 2°C CUT OFF

Horizontal vane motor (MV)

Color of the lead wire

Motor part

WHT-BLK BLK-RED

Color of the lead wire

BRN-YL W

Normal

295 Ω ~ 320 Ω 273 Ω ~ 296 Ω

Normal

4.5 ~ 5.5V

(When fan revolved one time)

Sensor part

BRN-GRY

0V → 5V → 0V

(Approx.)

Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C)

Normal

240 Ω ~ 260 Ω

BLK

BLK RED

BLK

FUSE

MAIN AUX.

REDWHT

ROTOR

BLK

9-6. TROUBLESHOOTING FLOW

When OPERATION INDICATOR lamp flashes 3 times. Indoor fan does not operate.

Check of indoor fan motor

Turn off the power supply. Check connector CN211 visually.

Reconnect the lead wires.

Disconnect 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.

Fuse (F11)

Is the resistance 0 (short circuit) or ∞ (open circuit)?

Indoor terminal P.C.board

Are lead wires connected?

Yes ( 0 or ∞ )

Replace the indoor fan motor.

Indoor power P.C.board

Varistor (NR11)

Yes

CN121

CN211

Are soldered points of the

connector correctly soldered to

the indoor power P.C. board?

Yes

Turn on the power supply. Stop it if the unit operates. Insert screwdriver into air outlet to rotate indoor fan motor slowly for 1 revolution or over, and measure the

(others)

voltage No.2(+) and No.1(-) on CN121.

Does the voltage repeat 0 V DC and 5 V DC?

Replace the indoor power/terminal P.C. board and the indoor control P.C. board.

Yes

Resolder it.

Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.

Check of remote controller and receiver P.C. board B

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. Check if the unit operates with the remote controller.

Does the unit operate with the remote controller?

Yes

No (not clear)

Replace the batteries. (Refer to 9-1.4.)

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 fluorescent lights of inverter or rapid-start type within the range of 1 m?

Replace the indoor electronic control P.C. board.

Yes

Replace the remote controller.

• Reinstall the unit away from lights.

• Attach a filter on receiving part.

The unit does not operate with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.

Check of indoor electronic control 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

Turn off the power supply. Check both “parts side” and “pattern side” of the indoor terminal P.C. board visually.

OPERATION switch?

Measure the resistance of indoor fan motor. Refer to 9-5.

Yes

Measure the resistance of the vane motor coil. Refer to 9-5.

Replace the varistor (NR11) and fuse (F11).

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?

Short circuit: Replace the indoor fan motor.

Short circuit: Replace the vane motor and the indoor electronic control P.C. board.

Yes

Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.

Indoor electronic control P.C.board

Indoor terminal P.C.board

JPG (GND)

CN10A

12 VDC

5 VDC

Indoor power P.C.board

Varistor (NR11)

Fuse (F11)

Is the resistance normal?

Yes

Measure the resistance of cement resistance R111 on the indoor power P.C. board.

R111

CN211

Replace the fuse (F11) and indoor fan motor.

Replace the fuse (F11).

Is the resistance approx. 4 ?

Yes

Is there approx. 5 VDC between 5 V (+) and JPG(GND) (–) of the indoor electronic control P.C.board? Is there approx. 9 V to 13 VDC between 12 V (+) and JPG (GND) (–) of the indoor electronic control P.C. board?

Are connector CN10A on the indoor electronic control P.C. board or lead wires disconnected?

Replace the indoor power/terminal P.C. board and the indoor fan motor.

Yes

Replace the fan motor.

Yes

Connect the connector or repair disconnection.

Replace the indoor power/terminal P.C. board.

9-7. TEST POINT DIAGRAM AND VOLTAGE

MS-C08VC MS-C10VC MS-C13VC

1. Indoor power P.C. board, Indoor terminal P.C. board

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 V DC

12 V DC

CN121

R111

GND

2. Indoor electronic control P.C. board

Timer short mode point JPG JPS (Refer to 7-1.)

Room temperature thermistor RT11 (CN111)

Indoor fan motor (CN211)

}

220-230-240 V AC

Emergency operation switch (E.O.SW) (SW1)

Indoor coil thermistor RT12 (CN112) 2 3 GND

Vane motor (CN151)

Connector to Indoor power P.C. board (CN10A)

12 V DC

5 V DC

Release of Auto restart function Solder the Jumper wire to JR07 (Refer to 7-3.)

Room temperature thermistor (RT11) Indoor coil thermistor (RT12)

Resistance (kΩ)

Temperature (°C)

DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

The terminal which has the locking mechanism can be detached as shown below. The terminal without locking mechanism can be detached by pulling it out.

Slide the sleeve and check if there is a locking lever or not.

Sleeve

1 Slide the sleeve. 2 Pull the terminal while

Locking lever

pushing the locking lever.

MS-C08VC MS-C10VC MS-C13VC

OPERATING PROCEDURE

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.

PHOTOS

Photo 1

Screws of the panel

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.

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/out-

door 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 elec-

trical 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 terminal

P.C. board.

(9) Remove the indoor power P.C. board and the indoor ter-

minal P.C. board.

Photo 2

Catch of indoor electronic control P.C. board holder

Photo 3

Catch of indoor electronic

control P.C. board holder

Lower catch

Electrical box

Screw of the electrical cover

V.A. clamp

Indoor coil thermistor

Indoor electronic control P.C. board holder

Terminal block

Indoor terminal P.C. board

Indoor power P.C. board

Upper catch

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 holder

(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

remove the nozzle assembly. (4) Loosen the screw fixing the line flow fan. (5)

Remove the screws fixing the motor bed. Lift the right

side of motor bed a little, and pull right to remove the fan

motor together with motor band/bed.

Remove the indoor coil thermistor from the heat exchanger.

(6) Install the indoor coil thermistor in its former position

when assembling it. (Refer to Photo 2.) (7) Remove the screws fixing the left side of the heat

exchanger. (8) Lift the left side of the heat exchanger, and pull out the

line flow fan to the lower-left.

the drain hose from the nozzle assembly, and

Photo 4

Screws of the vane motor

Photo 5

Screw of the line flow fan

Photo 6

Screws of the motor bed

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

New publication, effective Dec. 2008 Specifications subject to change without notice.

Mitsubishi MS-C08VC-F1, MS-C10VC-F1, MS-C13VC-F1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual