Hitachi Utopia PAS-3HVRG, Service Manual

Page: 27 / 127

1-24
TROUBLESHOOTING
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Melted Fuse for
Power Source
or Activation of
Outdoor Unit
Breaker
Check for breakage
of insulation. Remove short circuit
and replace fuse.
Short Circuit between Wires
Measure insulation
resistance. Remove short circuit to
ground and replace fuse. Short Circuited Wire
to Ground
Measure voltage by
tester.
Supply power. Power Failure of No Power Supply
Measure output voltage
of PCB1.
Replace PCB1. Incorrect Power Supply Circuit of PCB1
Measure resistance
between wires and
insulation resistance.
Replace comp. and
fuse.
Faulty Comp. Motor
Measure resistance
between wires and
insulation resistance.
Replace outdoor unit
fan motor and fuse. Faulty Outdoor Unit
Fan Motor
Melted Fuse for
Control Circuit
or Activation of
Outdoor Unit
Breaker
Check for breakage
of insulation. Remove short circuit
and replace fuse.
Short Circuit between Wires
Measure insulation
resistance. Remove short circuit
and replace fuse. Short Circuit of Control
Circuit (to Ground)
Disconnected
Wires Insufficient
Contacting or
Incorrect
Connection Check continuity of
wires.
Check for looseness
of connection screws.
Check terminal Nos.
Replacing wires,
repairing, tightening
screws and correct
wiring.
Between Outdoor Unit
and Indoor Unit
Power Source Wiring
for Outdoor Unit
Measure resistance
of coil. Replace magnetic
switch and fuse.
Faulty Solenoid Coil for
Magnetic Switch for Comp.
Motor
Measure resistance
between wires and
insulation resistance.
Replace fan motor
and fuse. Failure of Outdoor Unit
Fan Motor
Correctly connect wires.
Replace it if faulty.
Faulty PCB
(Outdoor Unit,
Indoor Unit)
Check connections.
Replacing Wires,
Repairing and
Tightening Screws
Correctly connect wires.
Check continuity
and looseness of
connection screws.
Check terminal Nos.
Disconnected Wires to PCB
Faulty PCB
Incorrect Wiring
(SW1 Setting and
CN2 Connection)
Disconnected Wire
Insufficient Contacting
Incorrect Wiring