Hitachi FS3 Series, Service Manual

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48
TROUBLESHOOTING
Alarm Code
39
Abnormality of Running Current at Constant Compressor
n
”RUN” light flickers and ”ALARM” is indicated on the remote control switch.
n
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.
‘
This alarm code is indicated when the following conditions occurs;
The running current of the constant compressor exceeds the value of overcurrent limitation during
operating.
The running current of the constant compressor is detected 0A and retry when 3 minutes are passed after
all compressors are stopped, and this phenomenon occurs three times within 30 minutes.
Does the CMC2 ~4 turn ON?
No
Check wiring connection around
PCB1.
Yes
Does the constant
compressor operate?
No
Check fuses and wiring between
CMC2 ~4 and constant compressor.
Yes
Is the running current
indicated on 7-Segment of
PCB1 at check mode?
No
Is the connector CN4 ~6 of
current transformer correctly
connected?
No
Connect it correctly.
Yes
Yes
Check constant compressor and
current transformer.
Remove the cause after checking.
Indication of 7-Segment
Abnormality of Constant Compressor
MC2
MC3
MC4