Hitachi Utopia RPI-2.5HRG - Page 31

TROUBLESHOOTING
1-28
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Decrease of
Discharge Gas
Superheat
Check mounting state.
(Refer to page 1-29.)
Measure resistance.
Faulty
Discharge
Gas
Thermistor
Fault
Replace thermistor
if faulty.
Correctly mount
thermistor.
Incorrect
Mounting
Check connections.
Remove looseness,
replace connector or
repair connections.
Incorrect
Connection
Check connections.
Replace PCB and
check operation.
Faulty PCB
Fault
Replace PCB if faulty.
Repair wiring
connections.
Disconnected
Wires for Ex.
Valve Control
Check ref. cycle and
the electrical system.
Repair wiring.
Ref. Cycle is Different from
the Electrical System
Measure pressure.
(Refer to Figure in
Test Run of TCII.)
Correctly charge
refrigerant.
Overcharged Refrigerant
Check ex. valve.
(Refer to 1.3.3 (4).)
Replace ex. valve
if faulty.
Faulty Ex. Valve