Fujitsu ASYA12LGC, Service Instruction

Page: 46 / 82

Self - diagnosis function and Checking points
Error Indication
Operation
(GREEN)
Timer
(ORANGE)
Error
(Protection)
Diagnosis Method
0.5 sec
2 times
When the indoor unit does not receive the signal for 10 consecutive seconds during the operation
>Permanent stop after 30seconds.
The outdoor unit does not receive the signal for 10 consecutive seconds from the time when the power relay was ON.
>Outdoor unit stops.
OFF
07
-0
3
Serial forward transfer error
during the operation
Serial forward transfer error
at starting up operation
Serial reverse transfer error
during the operation
Serial reverse transfer error
at starting up operation
At the start up, the indoor unit does not receive the signal for 10 consecutive seconds from the time when the power relay was ON.
>Permanent stop after 30 seconds.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
The room temperature thermistor detective a abnormai temperature when the power was turned on.
> Remote control does not operate.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
The detection value of the indoor heat exchanger thermistor is either open or shoted when the power is ON.
> Remote control does not operate.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Thermistor characteristic table").
Controller PCB defective.
Room temperature therm-
istor defective
Indoor heat exchanger
thermistor error
0.5 sec
3 times
0.5 sec
4 times
0.5 sec
5 times
0.5 sec
2 times
0.5 sec
3 times
0.5 sec
2 times
Wired remote controller
error
When the communication is cut off longer than 1 minutes upon connection. > Compressor , Outdoor fan : OFF
(If the communication becames normal, they automatically resume operation.
Check wiring
Controller PCB failure
When the outdoor unit does not receive the signal for 10 consecutive seconds during the operation > Outdoor unit stops.
[Diagnosis Point]
0.5 sec
8 times