1-68
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.
Condition of Activation: When the frequency of compressor is maintained at 15 to 18Hz after compressor
is started, one of the absolute value of running current at each phase
U+, U-, V+ and V- is less than 0.5A (including 0.5A).
Alarm
Code
Abnormality of Current Transformer (For 24 and 30HP)
*1): P17 is shown at 7-segment on the outdoor unit PCB.
*2): Perform the high voltage discharge work by referring to 1.3.6 before checking and replacing the inverter parts.
Replace Comp.
Restart operation.
No
Faulty ISPM and
replace ISPM. *2)
Compressor stops
immediately. (nearly 18Hz)
Compressor is not
operated.
P17 is appeared. *1)
How is compressor
operation when
restarted?
Is the coil resistance
of comp. normal?
Yes
Check ISPM.
No
Is output of ISPM
correct? *2)
Or is output of voltage
between U and V,
V and W, W and U?
