Hitachi RAS-2-HVNP Service Manual page 259

8. Troubleshooting
54
Alarm code
• The RUN LED flickers 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 fin excess 100 °C.
Restart the operation.
Does it trip soon?
No
Is the heat exchanger of the
outdoor unit clogged?
No
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.
245
SMGB0079 rev.0 - 01/2013
Abnormality of inverter fin temperature (RAS-(8-12)HN(P/C)(E))
Yes
Is thermistor short circuit or
faulty?
Yes
Yes
No
Replace the dipIPM, ISPM,
IPM. *1
Replace the thermistor
Remove the clogging
Faulty PCB2 or thermistor.
Replace it.
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