Self-Diagnosis Function And Checking Points; Serial Signal Diagnosis - Fujitsu ASYA07LGC Service Instruction

Self - diagnosis function and Checking points
Error Indication
Error
Operation Timer
(Protection)
(GREEN) (ORANGE)
OFF 0.5 sec Serial reverse transfer error
2 times at starting up operation
0.5 sec Serial reverse transfer error
3 times during the operation
0.5 sec Serial forward transfer error
4 times at starting up operation
0.5 sec Serial forward transfer error
5 times during the operation
0.5 sec Wired remote controller
8 times
error
0.5 sec 0.5 sec Room temperature therm-
2 times 2 times istor defective
0.5 sec Indoor heat exchanger
3 times thermistor error
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.)
When the indoor unit does not receive the signal for 10 consecutive seconds during the operation
>Permanent stop after 30seconds.
[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 outdoor unit does not receive the signal for 10 consecutive seconds from the time when the power relay was ON.
>Outdoor unit stops.
[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.)
When the outdoor unit does not receive the signal for 10 consecutive seconds during the operation > Outdoor unit stops.
[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.)
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.
[Diagnosis Point]
Check wiring
Controller PCB failure
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.
Diagnosis Method