Indoor unit failure mode table | Mitsubishi Electronics MSZ-GA22VA

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	Abnormal point
OPERATION	(Failure mode)
INDICATOR lamp	(Failure mode)
INDICATOR lamp
Not lighted	Normal	–	–

1-time flash	Room temperature	When the room temperature thermistor	Refer to the characteristics of the room
1-time flash	Room temperature	short or open circuit is detected every 8	Refer to the characteristics of the room
every 0.5-second	thermistor	short or open circuit is detected every 8	temperature thermistor (9-7.).
every 0.5-second	thermistor	seconds during operation.	temperature thermistor (9-7.).
		seconds during operation.

2-time flash		When the indoor coil thermistor short or	Refer to the characteristic of the main
2-time flash	Indoor coil thermistor	open circuit is detected every 8 seconds	indoor coil thermistor, the sub indoor coil
2.5-second OFF	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.).
		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	Serial signal error	not received for a maximum of 6 minutes.	and serial signal error".
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
11-time flash	Indoor fan motor	signal is not emitted during 12-second the	Refer to 9-6.A"Check of indoor fan
2.5-second OFF	Indoor fan motor	signal is not emitted during 12-second the	motor".
2.5-second OFF		indoor fan operation.	motor".
		indoor fan operation.

12-time flash		When it cannot properly read data in the	Replace the indoor electronic control
12-time flash	Indoor control system	nonvolatile memory of the indoor electronic	Replace the indoor electronic control
2.5-second OFF	Indoor control system	nonvolatile memory of the indoor electronic	P.C. board.
2.5-second OFF		control P.C. board.	P.C. board.
		control P.C. board.

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