2. Indoor unit failure mode table

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

Left lamp of

Abnormal point

Detection method

Check point

OPERATION

(Failure mode)

INDICATOR lamp

 

 

 

 

 

Not lighted

Normal

 

 

 

 

1-time flash

Room temperature

When the room temperature thermistor

Refer to the characteristics of the room

short or open circuit is detected every 8

every 0.5-second

thermistor

temperature thermistor (9-7.).

seconds during operation.

 

 

 

 

 

 

 

2-time flash

 

When the indoor coil thermistor short or

Refer to the characteristic of the main

Indoor coil thermistor

open circuit is detected every 8 seconds

indoor coil thermistor, the sub indoor coil

2.5-second OFF

 

during operation.

thermistor (9-7.).

 

 

 

 

 

 

3-time flash

Serial signal error

When the serial signal from the outdoor unit is

Refer to 9-6.D"How to check miswiring

2.5-second OFF

not received for a maximum of 6 minutes.

and serial signal error".

 

 

 

 

 

11-time flash

 

When the rotational frequency feedback

Refer to 9-6.A"Check of indoor fan

Indoor fan motor

signal is not emitted during 12-second the

2.5-second OFF

motor".

 

indoor fan operation.

 

 

 

 

 

 

 

12-time flash

 

When it cannot properly read data in the

Replace the indoor electronic control

Indoor control system

nonvolatile memory of the indoor electronic

2.5-second OFF

P.C. board.

 

control P.C. board.

 

 

 

 

 

 

 

13

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Mitsubishi Electronics MSZ-GA22VA, MSZ-GA25VA, MSZ-GA35VA service manual Indoor unit failure mode table

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