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 or No Power Supply
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 No.
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 the fan motor
and fuse.
Failure of Outdoor Unit
Fan Motor
Replace the fan module.
Correctly connect wires.
Replace it if faulty.
Failure of Fan Module
for Outdoor Fan
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 No.
Disconnected Wires to PCB
Faulty PCB
Incorrect Wiring
Disconnected Wire
Insufficient Contacting
Incorrect Wiring
Measure PCB1
output voltage. *1)
Replace PCB1.
PCB1 Power Circuit Failure
Check for unit number
setting of RSW on
Indoor PCB
Set unit number
correctly by RSW on
Indoor PCB.
Incorrect Setting of Indoor Unit Number
*1): 12VDC between VCC12 and GND2, 5VDC between VCC05 and GND1,
12VDC between VCC12 and GND1, 15VDC between VCC15 and GND1,
24VDC between VCC24 and GND1, 12VDC between VCC12T and GND1
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