Hitachi RPI-0.8FSG1 Service Manual page 40

TROUBLESHOOTING
Phenomenon
Power Failure of No Power Supply
Melted Fuse for
Power Source
or Activation of
Outdoor Unit
Breaker
Melted Fuse for
Control Circuit
or Activation of
Outdoor Unit
Breaker
Disconnected
Wires Insufficient
Contacting or
Incorrect
Connection
Faulty PCB
(Outdoor Unit,
Indoor Unit)
Incorrect Wiring
(SW1 Setting and
CN2 Connection)
1-30
Cause
Short Circuit between Wires
Short Circuited Wire
to Ground
Faulty Comp. Motor
Faulty Outdoor Unit
Fan Motor
Failure of AC Chopper
for Outdoor Fan
Short Circuit between Wires
Short Circuit of Control
Circuit (to Ground)
Faulty Solenoid Coil for
Magnetic Switch for Comp.
Motor
Failure of Outdoor Unit
Fan Motor
Failure of AC Chopper
for Outdoor Fan
Between Outdoor Unit
and Indoor Unit
Power Source Wiring
for Outdoor Unit
Disconnected Wires to PCB
Faulty PCB
Disconnected Wire
Insufficient Contacting
Incorrect Wiring
Check Item
Measure voltage by
tester.
Check for breakage
of insulation.
Measure insulation
resistance.
Measure resistance
between wires and
insulation resistance.
Measure resistance
between wires and
insulation resistance.
Check for breakage
of insulation.
Measure insulation
resistance.
Measure resistance
of coil.
Measure resistance
between wires and
insulation resistance.
Check continuity of
wires.
Check for looseness
of connection screws.
Check terminal Nos.
Check connections.
Check continuity
and looseness of
connection screws.
Check terminal Nos.
Action
(Turn OFF Main Switch)
Supply power.
Remove short circuit
and replace fuse.
Remove short circuit to
ground and replace fuse.
Replace comp. and
fuse.
Replace outdoor unit
fan motor and fuse.
Replace the AC chopper
for outdoor fan and fuse.
Remove short circuit
and replace fuse.
Remove short circuit
and replace fuse.
Replace magnetic
switch and fuse.
Replace the AC
chopper for outdoor fan,
fan motor and fuse.
Replace the AC chopper
for outdoor fan and fuse.
Replacing wires,
repairing, tightening
screws and correct
wiring.
Correctly connect wires.
Replace it if faulty.
Replacing Wires,
Repairing and
Tightening Screws
Correctly connect wires.