Hitachi RPI-0.8FSG1 Service Manual page 74

TROUBLESHOOTING
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
2.65 MPa (26.5 kg/cm
higher than 2.84 MPa (28.4 kg/cm
hour.
Is there a leakage of the
solenoid valves SVA?
Is the outdoor unit stop valve
closed?
Is the high-pressure sensor good?
Are ex. valves fully closed and
locked?
Are electric wiring and refrigerant
piping between the indoor and
outdoor unit incorrectly connected?
Check if indoor or outdoor intake
air temperature is too high.
Phenomenon
Excessively
High Discharge
Pressure
Stoppage of
Indoor Fan
<Wall Type Only>
1-64
Activation to Protect System from Excessively High Discharge Pressure
2
G) of discharge pressure [ in case of FSG, FSG1 and FXG models, Pd is
2
G)] and its occurrence is more than 3 times including 3 in one
Yes
No
Yes
No
No
Yes
Yes
No
Check the outdoor electronic expansion valve during cooling
and the indoor electronic expansion valve during heating.
Yes
No
Cause
Leakage of Solenoid Valve
SVA (Outdoor Unit)
Closed Stop Valve
Abnormal High Pressure
Sensor
Excessively High Indoor
Unit and Outdoor Unit
Inlet Air Temp.
Incorrect Connection between
Indoor Unit and Outdoor Unit
Locked Ex. Valve with
Fully Closed
Fully Closed Solenoid
Valve SVD1 (CH Unit)
<FX Series Only>
Melted Fuses
Faulty PCB
Replace the solenoid valve SVA
if faulty.
Open the stop valve.
Check connection of the circuit
board connector. Replace the
high-pressure sensor if faulty.
Check the circuit board and
connection of the circuit board
connector. Replace the electronic
expansion valves if faulty.
Correctly connect it.
In the case of H-LINK connection,
check the refrigeration cycle setting on
the PCB of outdoor unit and indoor unit.
Check Item
Check outlet temp. of
solenoid valve, SVA.
Check stop valve.
Check connectors for
PCB.
Check thermistor for
indoor unit and outdoor
unit inlet air temp.
Check electrical system
and ref. cycle.
Check connector for
PCB.
Check solenoid valve
SVD1 opening in
heating.
Check continuity of fuses.
Replace PCB and
check operation.
Action
(Turn OFF Main Switch)
Check connection.
Replace solenoid valve
SVA if faulty.
Open stop valve.
Replace pressure
sensor if faulty.
Replace thermistor
if faulty.
Correctly connect.
Repair connector for
PCB or ex. valve.
Replace it if faulty.
Replace coil or
CH unit if faulty.
Replace fuses.
Replace PCB
if faulty.