Hitachi UTOPIA RAS-4HVRP2E - Page 295

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
293
10
Alarm code
54
Abnormality of Inverter Fin Temperature
• Thealarmcodeisashed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nsoftheheatdissipationmodule
2 Thermistor failure
Main causes: Abnormality of driver temperature sampling circuit, and so on.
No
No
Yes
Yes
Restart operation.
Does it trip soon?
Is heat exchanger of outdoor
unit clogged?
Replace inverter PCB
Remove clogging
Replace inverter PCB