Hitachi RAS-18FSXN - Page 195

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
Expansion
Valve
Check ref. cycle and
the electrical system.
Repair wiring.
Ref. Cycle is Different from
the Electrical System
Check pressures.
Correctly charge
refrigerant.
Undercharge of Refrigerant
Check expansion valve.
Replace expansion valve
if faulty.
Faulty Expansion Valve
8 Troubleshooting
189
SMGB0065 rev. 1 - 12/2010
8