Hitachi FS3 Series, Service Manual, Page: 28 / 240

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