Service Manual
Table Of Contents
Troubleshooting SiUS04-921
130 Service Diagnosis
2.29 Output Overcurrent
Remote
Controller Display
L5
Outdoor Unit LED
Display
A5 55
Method of
Malfunction
Detection
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Malfunction
Decision
Conditions
A position signal error occurs while the compressor is running.
A speed error occurs while the compressor is running.
The machine shuts down when the signal of output overcurrent is sent 8 times from the output
overcurrent detection circuit to the microcomputer.
Clear condition: The machine continuously runs for about 11 minutes (without fault).
Supposed
Causes
Overcurrent due to defective power transistor
Overcurrent due to wrong internal wiring
Overcurrent due to abnormal supply voltage
Overcurrent due to defective PCB
Detection error due to defective PCB
Overcurrent due to closed stop valve
Overcurrent due to defective compressor
Overcurrent due to poor installation condition
Defective indoor solenoid valve