30
Inverter compressor drive error diagnosis and solution (P4)
Error Code P4
Malfunction decision conditions
An abnormal inverter compressor drive is detected by a special detection circuit,
including communication signal detection, voltage detection, compressor rotation speed
signal detection.
Supposed causes
S Wiring mistake; IPM malfunction; outdoor fan ass'y faulty
S Compressor malfunction; Outdoor PCB faulty
Fig. 40 – Troubleshooting
Main Parts Check
Temperature sensor checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Fig. 41 – Tester
Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi−meter.
To Next Page
Loading...
Need help?
General
