1-74
TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the
alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to
second time of abnormality occurrence.
Conditions: This alarm is indicated when the temperature of the internal themostat for ISPM is higher
than 100
o
C.
1*): Regarding replacing or checking method for ISPM, refer to page 1-114.
2*): Use the silicon grease provided as accessory (Service Parts No.: P22760).
Alarm
Code
Increase in Inverter Fin Temperature (Only 24 and 30HP)
Yes
No
Restart operation.
Does it trip soon?
Is the heat exchanger of
outdoor unit clogged?
No
Apply the silicon grease
between ISPM and fin
securely. *2)
Replace the ISPM.
Replace the ISPM. *1)
Remove clogging.
Yes
Yes
No
Is the silicon grease coated
securely between ISPM and
fin?
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