Hitachi RPI-1.0FSG1 - Page 73

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TROUBLESHOOTING
 “RUN” light flickers and “ALARM” is indicated on the remote control switch.
 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.
Alarm
Code
Activation to Protect System from Excessively Low Suction Pressure
Is there a leak in the
solenoid valve SVA?
Is the low-pressure sensor good?
Check if the indoor/outdoor intake
air temperature is too high.
Replace the low-pressure sensor
if faulty.
Replace the solenoid valve SVA
if faulty.
No
No
Yes
Yes
Is the four-way valve spindle
mounted at middle position?
Replace the four-way valve if faulty.
No
Yes
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Excessively
Low Suction
Pressure
Check outlet pipe temp.
of solenoid valve, SVA.
Check connecting wires.
Replace solenoid valve,
SVA if faulty.
Leakage of Solenoid
Valve SVA
Measure suction gas
pipe temp. of 4-way
valve.
Replace 4-way valve
if faulty.
Valve Stoppage at Medium
Position of 4-Way Valve
Check connectors of
PCB and power source.
Replace sensor if faulty.
Abnormal Suction
Pressure Sensor
Check indoor unit and
outdoor unit suction
air temp. thermistor.
Replace thermistor
if faulty.
Excessively High Indoor
Unit and Outdoor Unit
Suction Air Temperature
<FX Series Only>
Check Solenoid Valve.
Replace SVD1 and
SVS1 if leaking.
Leakage from Solenoid
Valve: SVD1, SVS1 of
CH Unit