Fujitsu AW?Z24LBC, Service Instruction

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Self - diagnosis function and Checking points
Error Indication
Operation
(RED)
Timer
(GREEN)
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 30 seconds. 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
07-03
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.)
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.)
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 do
se
not operate. [Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics 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