Hitachi Utopia PAS-3HVRG, Service Manual

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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 alarm code is indicated on the display of the outdoor unit PCB.
If the stoppage of the unit is caused by cooling overload or heating overload, the alarm code 41 or 42
is indicated.
This alarm is indicated when one of safety devices is activated during compressor running.
Alarm
Code
Activation of Safety Device in Outdoor Unit
Does CMC ON
when starting?
Is the voltage
between #1-#3 of
PCN9 220V or 240V
during Y52C ON?
Faulty PCB1
No
No
Normal PCB1
Yes
Yes
Does CMC turn
ON for more than
3 seconds?
Yes
Yes
Check activation of the following safety devices. Remove the cause after checking.
PSH: 3.3MPa (33 kgf/cm 2 G)
Is the protective
device still operating?
No
No
No
Faulty PCB1
Faulty CMC
Is the A contact of
CMC activated?
Check the coil
for CMC.
Good Faulty
Yes