Hitachi UTOPIA RAS-4HVRP2E Service Manual page 295

10 Troubleshooting
Troubleshooting procedure
54
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.
When the following condition occurs three times in 30 minutes, the operation stops and this alarm code is displayed. If
this occurs less than three times in 30 minutes, the operation automatically restarts.
Condition of Activation:
1 Fin temperature increases
Main causes: Increased temperature of the fins of the heat dissipation module
2 Thermistor failure
Main causes: Abnormality of driver temperature sampling circuit, and so on.
Restart operation.
Does it trip soon?
No
Is heat exchanger of outdoor
unit clogged?
No
293 SMGB0136 rev.0 - 07/2021
Abnormality of Inverter Fin Temperature
Yes
Yes
Replace inverter PCB
Remove clogging
Replace inverter PCB
10