Service manual

12
2. Indoor unit failure mode table
Left lamp of OPERATION
INDICATOR lamp
Abnormal point
(Failure mode)
Condition Correspondence
Not lighted Normal — —
1-time fl ash every
0.5-second
Room temperature
thermistor
The room temperature thermistor short or
open circuit is detected every 8 seconds dur-
ing operation.
Refer to the characteristics of the room temperature
thermistor (8-7.).
2-time fl ash
2.5-second OFF
Indoor coil ther-
mistor
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
Refer to the characteristics of the main indoor coil ther-
mistor, the sub indoor coil thermistor (8-7.).
11-time fl ash
2.5-second OFF
Indoor fan motor
The rotational frequency feedback signal is
not emit during the 12 seconds the indoor fan
operation.
Refer to 8-6. "Check of indoor fan motor".
12-time fl ash
2.5-second OFF
Indoor control
system
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Replace the indoor electronic control P.C. board.
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).