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2. Indoor unit failure mode table
NOTE:
Blinking patterns of this mode differs from the ones of Troubleshooting check table (10-4.).
12-time flash
2.5-second OFF
Replace the indoor electronic control
P.C. board.
Indoor control system
When it cannot properly read 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 (10-7.).
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 (10-7.).
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 (10-7.).
Indoor coil thermistor
(Main 3)
When the indoor coil thermistor short or
open circuit is detected every 8 seconds
during operation.
11-time flash
2.5-second OFF
Indoor fan motor (Upper)
Refer to 10-6. "How to check miswiring
and serial signal error".
Refer to 10-6 -1 "Check of indoor
fan motor (Upper)"
Refer to 10-6 -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
When the damper is not located at the
designated position.
14-time flash
2.5-second OFF
Damper
Refer to 10-6. "Check of damper".
Not lighted
Not lighted
Not lighted
Right lamp of
OPERATION
INDICATOR lamp
Remedy
Abnormal point
(Failure mode)
Condition
OB409E
