Hitachi RAS-3-HVNC - Page 259

8. Troubleshooting
245
SMGB0079 rev.0 - 01/2013
8
Alarm code
54
Abnormality of inverter n temperature (RAS-(8-12)HN(P/C)(E))
• The RUN LED ickers and “ALARM” is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- This alarm code is indicated after the operation is stpped when the following condition occurs three times within 30
minutes. The retry operation is performed twice.
Conditions:
• When the temperature of the thermistor for inverter n excess 100 °C.
No
Replace the dipIPM, ISPM,
IPM. *1
Restart the operation.
Does it trip soon?
Yes
Remove the clogging
Is the heat exchanger of the
outdoor unit clogged?
Faulty PCB2 or thermistor.
Replace it.
No
Is thermistor short circuit or
faulty?
No
Yes
Replace the thermistor
Yes
N O T E
1*):Performthehighvoltagedischargeworkbyreferringtothe itemProcedureof checkingothermainparts,
beforecheckingandreplacingtheinvertercomponents.