2. Indoor unit failure mode table
12-time flash
2.5-second OFF
Replace the indoor electronic control
P.C. board.
Indoor control system
When it cannot be read properly data in the
nonvolatile memory of the indoor electronic
control P.C. board.
When the rotational frequency feedback
signal is not emitted during 12-second the
indoor fan operation.
2-time flash
2.5-second OFF
Refer to the characteristic of the main 1,2
indoor coil thermistor and the sub indoor
coil thermistor (9-7.).
Indoor coil thermistor
(Main 1, 2 and sub)
When the indoor coil thermistor short or
open circuit is detected every 8 seconds
during operation.
3-time flash
2.5-second OFF
Serial signal error
When the serial signal from the outdoor unit is
not received for a maximum of 6 minutes.
1-time flash
every 0.5-second
Refer to the characteristics of the room
temperature thermistor (9-7.).
Room temperature
thermistor
When the room temperature thermistor
short or open circuit is detected every 8
seconds during operation.
Not lighted –Normal –
Left lamp of
OPERATION
INDICATOR lamp
13-time flash
2.5-second OFF
Replace to the characteristic of the main
3 indoor coil thermistor (9-7.).
Indoor coil thermistor
(Main 3)
When the indoor coil thermistor short or
open circuit is detected every 8 seconds
during operation.
When the damper is not located at the
designated position.
14-time flash
2.5-second OFF
Damper
11-time flash
2.5-second OFF
Indoor fan motor (Upper)
Refer to 9-6. "How to check miswiring
and serial signal error".
Refer to 9-6. "Check of damper".
Refer to 9-6 -1 "Check of indoor
fan motor (Upper)"
Refer to 9-6 -2 "Check of indoor
fan motor (Lower)"
Indoor fan motor (Lower)
1-time flash
every 0.5-second
Not lighted
Not lighted
Not lighted
Not lighted
Not lighted
Not lighted
Not lighted
Not lighted
Right lamp of
OPERATION
INDICATOR lamp
Countermeasure
Abnormal point
(Failure mode)
Check point
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