Hitachi RAS-10FXG - 2.3.3 Removing Indoor Fan and Fan Motor; 4.5.4 Emergency Operation

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TROUBLESHOOTING
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Excessively High
Discharge Gas
Temperature
(at Top of
Compressor)
Check mounting state.
Check resistance
of thermistor.
Faulty
Discharge
Gas
Thermistor
Fault
Replace thermistor
if faulty.
Correctly mount
thermistor.
Incorrect
Mounting of
Thermistor
Check connections.
Remove looseness,
replace connectors or
repair connections.
Incorrect
Wiring
Check connections.
Replace PCB and
check operation.
Faulty PCB
Fault
Replace PCB if faulty.
Repair wiring
connections.
Disconnected
Wires for Ex.
Valve
Check ref. cycle and
the electrical system.
Repair wiring.
Ref. Cycle is Different from
the Electrical System
Ref. Leakage
Replace solenoid
valve if faulty.
Faulty Gas Bypass
Solenoid Valve
Check pressures.
Correctly charge
refrigerant.
Shortage of Refrigerant
Check ex. valve
(Refer to 1.3.6).
Replace ex. valve
if faulty.
Faulty Ex. Valve