Hitachi FSG Series Service Manual page 28

1
TROUBLESHOOTING
20
Alarm Code
02
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 is indicated when one of safety devices is activated during compressor running.
No
Does CMC1 ON
when startting?
Yes No
No Voltage
Does CMC1 turn ON
for more than 3
seconds
Yes
Normal PCB1
Check activation of the following safety devices. Remove the cause after checking.
(PSH: 3.0MPa (30 kgf/cm²G) for FS3 Series / 3.3MPa (33 kgf/cm²G) for FSG Series)
Check Item
Power Suplly Connector for CMC1
380-415V 50Hz PCN3
Activation of Safety Device in Outdoor Unit
No
Is Y52C1 of
7-segments ON? (when
in check mode "SC")
Yes
Is the voltage
No
between PCN3#1 and
faston terminal "N"
220V or 240V during
Y52C1 ON?
Yes
No
Is the protective
device still operating?
(No continuity between
#1 and #3 of PCN2)
Yes
€ High Pressure Switch
Faston Terminal
N
No (No Looseness)
Yes
Is PCN3 or PCN2
loosened?
Faulty PCB1
Faulty PCB1
Faulty PCB1
Restart after
connecting PCN3 or
PCN 2 correctly.
Faulty PCB1