Hitachi EV-1.5N1, Service Manual

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8. Troubleshooting
242
SMGB0079 rev.0 - 01/2013
Alarm code
53
Activation of transistor module (RAS-(8-12)HN(P/C)(E))
• 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.
- IPM or Dip IPM and PCB2 have detecting function of abnormality. This alarm is indicated when the transistor mod-
ule detect the abnormality 7 times in 30 minutes including 7. Retry operation is performed up to the occurrence of
6 times.
Conditions:
• The abnormal current such as short circuited, grounded or the overcurrent occurs at the transistor module.
• The temperature at transistor module increases abnormally.
• The control voltage decreases.
• The angle difference between the shaft in compressor and the shaft in the control program e60deg.