Self-Diagnosis Function And Checking Points; Serial Signal Diagnosis - Fujitsu ASU9RLQ Service Instructions Manual

Self - diagnosis function and Checking points
Error Indication
Wired remote
Operation Timer controller
(RED) (GREEN)
OFF 0.5 sec
2 times
01
0.5 sec
3 times
01
0.5 sec
4 times
13
0.5 sec
5 times
13
0.5 sec 0.5 sec
2 times 2 times
02
0.5 sec
3 times
04
Error
(Protection)
Serial reverse transfer 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.
at starting up operation >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.)
Serial reverse transfer error
When the indoor unit does not receive the signal for 10 consecutive seconds during the operation
during the operation 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.)
Serial forward transfer error
The outdoor unit does not receive the signal for 10 consecutive seconds from the time when the power relay was ON.
>Outdoor unit stops.
at starting up operation
[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.)
Serial forward transfer error
When the outdoor unit does not receive the signal for 10 consecutive seconds during the operation > Outdoor unit stops.
during the operation
[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.)
Room temperature therm- The room temperature thermistor detective a abnormai temperature when the power was turned on. > Remote control does not
operate.
istor defective
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
Indoor heat exchanger The detection value of the indoor heat exchanger thermistor is either open or shoted when the power is ON. > Remote control dose
not operate.
thermistor error
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
Diagnosis Method
>Permanent stop after 30