Hitachi UTOPIA RAS-4HVRP2E Service Manual page 292

10 Troubleshooting
Troubleshooting procedure
51
Alarm code
• The alarm code is flashed on the 7-segment display of the outdoor unit.
• The alarm code is displayed on the wired controller of the indoor unit.
If abnormal current detection occurs, the compressor stops. The operation automatically restarts after three minutes. If
this occurs again twice in the next 30 minutes, this alarm code is displayed.
Condition of Activation:
1 Picking up circuit for inverter current is not central value before the compressor starts operation.
2 Inverter secondary current es excessively low when the compressor starts operation.
Restart operation
How does compressor
operate when restarted?
290 SMGB0136 rev.0 - 07/2021
Abnormality of Current Sensor for Inverter
Compressor stops immediately at
low frequency
"P7" indication appears without
compressor operation
Is coil resistance of
compressor normal?
Check inverter PCB
Replace wiring for inverter PCB
No
Yes
Abnormal
Normal
Inverter PCB is faulty.
Replace it.
Replace compressor
Replace inverter PCB