Service Manual

8. Troubleshooting
238
SMGB0079 rev.0 - 01/2013
Alarm code
53
Activation of transistor module (RAS-(2-2.5)HVNP / RAS-3HVNC)
• 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.
- ISPM has a detection function of the abnormal operation. This alarm is displayed when the ISPM module detects
the abnormal operation 7 times or more than 7 times in 30 minutes. The retry operation is performed six times.
Conditions:
• The abnormal current to the ISPM, such as short-circuited, grounded, overcurrent or control voltage decrease.
Replace electrical box
N O T E
• *1)RegardingreplacingorcheckingmethodforISPM,refertoitemProcedureofcheckingothermainparts.
• *2)Setthe#1pinofDIPswitchonISPMtoONwhenyouarerestartingwiththeterminalsofthecompressor
disconnected.Afterthetroubleshooting,set#1pinofDIPswitchDSW1onISPMtoOFF.