9-4. Troubleshooting check table

Lighted

· Flashing of OPERATION INDICATOR lamp (left-hand side lamp)

indicates abnormalities.

OPERATION INDICATOR

 

Blinking

 

Not lighted

NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table

No.

Abnormal

Operation indicator lamp

Symptom

Detection method

Check point

 

point

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

Mis-Wiring

0.5-second ON

 

• Refer to 9-6.D"How to check

 

 

and outdoor

When the serial signal from the outdoor unit is

1

or serial

 

mis-wiring and serial signal

 

unit do not

not received for a maximum of 6 minutes.

 

signal

 

error".

 

 

operate.

 

 

 

 

 

 

 

 

0.5-second OFF

 

 

 

 

Outdoor

 

 

When it cannot properly read data in the

• Check the blinking pattern of

 

 

Outdoor unit

the LED on the inverter P.C.

2

control

Left lamp lights up

nonvolatile memory of the inverter P.C. board

board or the outdoor

does not

or the outdoor electronic control P.C. board.

 

system

 

electronic

 

 

operate.

 

 

 

 

 

control P.C. board.

 

 

 

 

 

 

Indoor coil

Left lamp flashes.

 

 

 

 

thermistor

 

 

 

 

2-time flash

Indoor unit

When the indoor coil or the room temperature

• Refer to 9-7.the

 

 

3

 

 

and outdoor

thermistor is shorts or opens circuit.

characteristics of indoor coil

Room

 

unit do not

 

thermistor, and the room

 

tempera-

2.5-second OFF

operate.

 

temperature thermistor.

 

ture

 

 

 

 

 

 

 

 

 

thermistor

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

 

3-time flash

When the rotational frequency feedback

• Refer to 9-6.A"Check of

 

Indoor fan

 

and outdoor

4

 

signal is not emitted during the indoor fan

motor

 

unit do not

indoor fan motor".

 

 

operation.

 

 

 

operate.

 

 

 

 

 

 

 

 

2.5-second OFF

 

 

 

 

Indoor

Left lamp flashes.

Indoor unit

When it cannot properly read data in the

 

 

4-time flash

 

 

and outdoor

• Replace the indoor electronic

5

control

 

nonvolatile memory of the indoor electronic

 

unit do not

control P.C. board.

 

system

 

control P.C. board.

 

 

operate.

 

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

When it consecutively occurs 3 times that the

• Refer to "Check of inverter/

 

Outdoor

5-time flash

 

compressor".

6

power

 

and outdoor

compressor stops for overcurrent protection or

Refer to service manual

 

unit do not

start-up failure protection within 1 minute after

 

system

 

OB379 or OB377.

 

 

operate.

start-up.

 

 

2.5-second OFF

Check the stop valve.

 

 

 

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

 

6-time flash

Indoor unit

When the outdoor thermistors short or open

• Refer to "Check of outdoor

 

Outdoor

 

and outdoor

thermistor".

7

 

unit do not

circuit during the compressor operation.

Refer to service manual

thermistors

 

 

 

operate.

 

OB379 or OB377.

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

• Replace the inverter P.C.

 

Outdoor

7-time flash

When it cannot properly read data in the

board or the outdoor

 

and outdoor

8

control

 

nonvolatile memory of the inverter P.C. board

electronic control P.C. board.

 

unit do not

 

system

 

or the outdoor electronic control P.C. board.

Refer to service manual

 

 

operate.

 

 

2.5-second OFF

 

OB379 or OB377.

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

Other

14-time flash

An abnormality other than above mentioned is

• Confirm the abnormality in

9

 

and outdoor

detail using the failure mode

abnormality

 

unit do not

detected.

 

 

 

operate.

 

recall function.

 

 

2.5-second OFF

 

 

 

 

 

 

 

NOTE : When the indoor unit has started operation and the above 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.

15

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Mitsubishi Electronics MSZ-GA25VA, MSZ-GA22VA, MSZ-GA35VA service manual Troubleshooting check table, Indicates abnormalities

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