Hitachi RAS-H(V)RNME-AF Service Manual page 390

12 Troubleshooting
51
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 when the below condition is activated 3 times including 3 in 30 minutes. Retry ope-
-
ration is performed up to the occurrence of 2 times.
- Condition of activation:
Š When the frequency of compressor is maintained at 15 to 18Hz after compressor is started, one of the abso-
lute value of running current at each phase is less than 1.5A (including 1.5A).
Restart the operation
How is the compressor
operation when you restart
the compressor?
*1) P7 is shown at 7-segment on the outdoor unit PCB.
*2) Perform the high voltage discharge work by referring to the item Procedure of checking other main parts
king and replacing the inverter parts.
380
SMGB0070 rev. 1 - 08/2011
Abnormal operation of the current transformer (0A detection) (RAS-(3-10)H(V)RNME-AF)
Compressor stops immedia-
tely (nearly 18Hz)
Compressor does not operate
P7 is displayed *1)
Is the coil resistance of
the comp. normal?
Is output of ISPM, IPM or
dipIPM correct?
Or is the voltage between
U-V, V-W and W-U?
Replace dip IPM, IPM if faulty
No
Yes
Yes
No
Power wiring of the comp. is
not through CT.
Pass the wires through CT
Faulty PCB2.
Replace PCB2 *2)
Replace the compressor
Replace PCB2
before chec-