Daikin FTKS20D2VMWL, Service Manual

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SiENBE04-507A Troubleshooting
Service Diagnosis 139
4.22 Output Over Current Detection
Remote
Controller
Display
L5
Method of
Malfunction
Detection
An output over-current 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.
„ An output over-current input is fed from the output over-current detection circuit to the
microcomputer.
„ The system will be shut down if the error occurs 255 times.
„ Clearing condition: Continuous run for about 10 minutes (normal)
Supposed
Causes
„ Over-current due to defective power transistor
„ Over-current due to wrong internal wiring
„
Over-current due to abnormal supply voltage
„ Over-current due to defective PCB
„ Error detection due to defective PCB
„ Over-current due to closed stop valve
„ Over-current due to compressor failure
„ Over-current due to poor installation condition