Hitachi RPI-0.8FSG1 Service Manual page 73

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 compressor is operated under the conditions higher than
0.9 MPa of suction pressure and its occurrence is more than 3 times including 3 in one hour.
Is there a leak in the
solenoid valve SVA?
No
Is the four-way valve spindle
mounted at middle position?
No
Is the low-pressure sensor good?
Yes
Check if the indoor/outdoor intake
air temperature is too high.
Phenomenon
Excessively
Low Suction
Pressure
Activation to Protect System from Excessively Low Suction Pressure
Yes
Yes
No
Cause
Leakage of Solenoid
Valve SVA
Valve Stoppage at Medium
Position of 4-Way Valve
Abnormal Suction
Pressure Sensor
Excessively High Indoor
Unit and Outdoor Unit
Suction Air Temperature
Leakage from Solenoid
Valve: SVD1, SVS1 of
CH Unit
<FX Series Only>
Replace the solenoid valve SVA
if faulty.
Replace the four-way valve if faulty.
Replace the low-pressure sensor
if faulty.
Check Item
Check outlet pipe temp.
of solenoid valve, SVA.
Measure suction gas
pipe temp. of 4-way
valve.
Check connectors of
PCB and power source.
Check indoor unit and
outdoor unit suction
air temp. thermistor.
Check Solenoid Valve.
TROUBLESHOOTING
Action
(Turn OFF Main Switch)
Check connecting wires.
Replace solenoid valve,
SVA if faulty.
Replace 4-way valve
if faulty.
Replace sensor if faulty.
Replace thermistor
if faulty.
Replace SVD1 and
SVS1 if leaking.
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