Hitachi UTOPIA RAS-4HVRP2E - Page 258

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
256
Alarm code
54
Abnormalityoftheinverterntemperature
• This alarm code is indicated after the operation is stopped when the following conditions occur three times within
30 minutes. The retry operation is performed twice.
• Conditions of activation:
- Whenthetemperatureofthethermistorforinverternexceeds80°C.
• This alarm forces all operations to stop (Outdoor & Indoor Units).
• The unit should be stopped to release the alarm.
Remove clogging
Is the heat
exchanger of outdoor
unit clogged?
No
Yes
Replace inverter PCB. *1)
Yes
Replace inverter PCB. *1)
No
Restart operation.
Does it trip soon?
? NOTE
1*): Perform the high voltage discharge work by referring to the item “10.4.1.4 Checking procedure for other parts”, before checking and
replacing the inverter components.