Fujitsu ASYA12LGC, Service Instruction

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Self - diagnosis function and Checking points
Error Indication
Operation
(GREEN)
Timer
(ORANGE)
Error
(Protection)
Diagnosis Method
0.5 sec
2 times
The detection value of the outdoor heat exchanger thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
The detection value of the outdoor temperature thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
0.5 sec
3 times
07
-0
4
Forced auto switch error
Outdoor temperature ther-
mistor error
Outdoor heat exchanger
thermistor error
Discharge thermistor error
The detection value of the discharge thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
Forced auto switch becomes ON for 30 consecutive seconds.
> It indicates the error but the operation continues.
[Diagnosis Point]
Check if forced auto switch is kept pressed.
Forced auto switch defective.
Controller PCB defective.
After 2 minutes 20 seconds of stopping operation, the signal from outdoor unit is received even though the main relay is OFF.
> Main relay OFF continues (outdoor unit OFF command)
[Diagnosis Point]
Main relay defective
Controller PCB defective.
Main relay error
0.5 sec
3 times
0.5 sec
4 times
0.5 sec
2 times
0.5 sec
3 times
0.5 sec
4 times