Hitachi RPI-0.8FSG1 Service Manual page 57

Alarm
Code
G "RUN" light flickers and "ALARM" is indicated on the remote control switch.
G 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 thermistor is short-circuited (less than 0.24 kΩ) or cut (greater
than 840 kΩ) during the cooling or heating operation. The system is automatically restarted when
the fault is removed.
Is it connected to
THM5 of PCB?
Yes
Is resistance of THM5
between 0.24kΩ and
840kΩ?
Yes
Faulty PCB
Phenomenon
Faulty Thermistor
for Indoor Unit
Heat Exchanger
Gas Pipe Temp.
Faulty PCB
Abnormality of Thermistor for Indoor Unit Heat Exchanger
Gas Refrigerant Pipe Temperature (Gas Piping Thermistor)
No
Connect it.
No
Faulty Thermistor
Refer to page 1-44 for
thermistor resistance.
Cause
Fault
Incorrect Connection
Thermistor for
Heat Exchanger
Gas Pipe
In Case of 4-Way Cassette Type
Check Item
Check resistance.
Check wiring to PCB.
Replace PCB and
check operation.
TROUBLESHOOTING
Action
(Turn OFF Main Switch)
Replace thermistor
if faulty.
Repair wiring and
connections.
Replace PCB if faulty.
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