Hitachi RPI-0.8FSG1 Service Manual page 65

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 pressure sensor voltage decreases lower than 0.1V or
increases higher than 4.9V during running.
Is the connection CN8
of the outdoor unit
PCB1 mated loose?
No
Is 5 VDC applied across
#1 and #3 of the connector
CN8 of the outdoor circuit
board PCB1?
Yes
Is voltage under 0.1 VDC
or over 4.9 VDC across
#2 and #3 of the connector
CN8 of the outdoor circuit
board PCB1?
Yes
Is the Check Joint
clogged?
No
Abnormality with Low
Pressure Sensor.
Phenomenon
Faulty Low
Pressure Sensor
Faulty PCB
Indicated
Pressure Value
is Excessively
High or Low
Abnormality of Low Pressure Sensor
Yes
No
No
Yes
Cause
Fault
Incorrect Connection
Malfunction of Pressure
Sensor due to Faulty
Check Joint
(Outdoor Unit)
Check Item
Check output voltage
is correct.
Check connections.
Replace PCB and
check operation.
Check for clogging
of check joint.
TROUBLESHOOTING
Connect correctly.
Faulty PCB1
Faulty PCB1
Replace the check joint.
Action
(Turn OFF Main Switch)
Replace pressure
sensor if faulty.
Repair wiring and
connections.
Replace PCB if faulty.
Replace check joint.
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