Hitachi RPI-0.8FSG1 Service Manual page 61

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 CN7
of the outdoor unit
PCB1 bad?
No
Is 12 VDC applied
across #1 and #3 of the
connector CN7 of the
outdoor unit PCB1?
Yes
Is voltage under
0.1 VDC or over 4.9VDC
across #2 and #3 of the
connector CN7 of the
outdoor unit PCB1?
Yes
Clogged Check Joint?
No
Abnormality of High
Pressure Sensor.
Phenomenon
Faulty High
Pressure Sensor
Faulty PCB
Indicated
Pressure Value
is Excessively
High or Low
Abnormality of High Pressure Sensor for Outdoor Unit
Yes
No
No
Yes
Cause
Fault
Incorrect Connection
Malfunction of Pressure
Sensor due to Faulty
Check Joint
Faulty PCB1.
Check Item
Check output voltage
is correct.
Check connections.
Replace PCB and
check operation.
Check for clogging
of check joint.
TROUBLESHOOTING
Connect correctly.
PCB1 defective.
Replace 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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