Hitachi RPI-0.8FSG1 Service Manual page 50

TROUBLESHOOTING
Phenomenon
Decrease of
Discharge Gas
Superheat
1-40
Cause
Ref. Cycle is Different from
the Electrical System
Overcharged Refrigerant
Faulty Ex. Valve
Fault
Faulty PCB
Disconnected
Wires for Ex.
Valve Control
Fault
Faulty
Discharge Incorrect
Gas Mounting
Thermistor
Incorrect
Connection
Check Item
Check ref. cycle and
the electrical system.
Measure pressure.
(Refer to Figure in
Test Run of TCII.)
Check ex. valve
(Refer to 1.3.6).
Replace PCB and
check operation.
Check connections.
Measure resistance.
Check mounting state.
(Refer to page 1-39.)
Check connections.
Action
(Turn OFF Main Switch)
Repair wiring.
Correctly charge
refrigerant.
Replace ex. valve
if faulty.
Replace PCB if faulty.
Repair wiring
connections.
Replace thermistor
if faulty.
Correctly mount
thermistor.
Remove looseness,
replace connector or
repair connections.