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2. Indoor unit failure mode table
Upper lamp of OP-
ERATION INDICA-
TOR 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 (10-7.2,3.).
2-time fl ash
2.5-second OFF
Indoor coil
thermistor
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 (10-7.2,3.).
3-time fl ash
2.5-second OFF
Serial signal
The serial signal from outdoor unit is not re-
ceived for a maximum of 6 minutes.
Refer to 10-6.
"How to check miswiring and serial
signal error".
11-time fl ash
2.5-second OFF
Indoor fan motor
The rotational frequency feedback signal is not
emitted during the 12 seconds the indoor fan
operation.
Refer to 10-6. "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 (10-4.).
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