Hitachi FSXN Series Service Manual page 195

8 Troubleshooting
Phenomenon
Ref. Cycle is Different from
the Electrical System
Undercharge of Refrigerant
Faulty Expansion Valve
Excessively High
Discharge Gas
Temperature
Faulty PCB
(at Top of
Compressor)
Faulty
Discharge
Gas
Thermistor
189
SMGB0065 rev. 1 - 12/2010
Cause Check Item
Check ref. cycle and
the electrical system.
Check pressures.
Check expansion valve.
Replace PCB and
Fault
check operation.
Disconnected
Wires for
Check connections.
Expansion
Valve
Check resistance
Fault
of thermistor.
Incorrect
Mounting of Check mounting state.
Thermistor
Incorrect
Check connections.
Wiring
Action
(Turn OFF Main Switch)
Repair wiring.
Correctly charge
refrigerant.
Replace expansion valve
if faulty.
Replace PCB if faulty.
Repair wiring
connections.
Replace thermistor
if faulty.
Correctly mount
thermistor.
Remove looseness,
replace connectors or
repair connections.
8