Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Power failure or no power supply Measure the voltage using the tester Supply the power
Blown out fuse for the power source
or activation of the outdoor unit
breaker
Short circuit between wires
Check the insulation material for
breaks
Remove the short circuit and
replace the fuse
Short-circuited wire to ground Measure the insulation resistance
Remove the short circuit to ground
and replace the fuse
Faulty comp. motor
Measure the resistance between the
wires and the insulation resistance
Replace the comp. and the fuse
Faulty outdoor unit fan motor
Measure the resistance between the
wires and the insulation resistance
Replace the outdoor unit fan motor
and the fuse
Blown out fuse for control circuit or
activation of outdoor unit breaker
Short circuit between wires
Check the insulation material for
breaks
Remove the short circuit and
replace the fuse
Short circuit of the control circuit (to
ground)
Measure the insulation resistance
Remove the short circuit and
replace the fuse
Faulty solenoid coil for the magnetic
switch for the comp. motor
Measure the resistance of coil
Replace the magnetic switch and
the fuse
Failure of the outdoor unit fan motor
Measure the resistance between the
wires and the insulation resistance
Replace the outdoor unit fan motor
and fuse
Faulty transformer Measure input voltage Replace transformer
Disconnected wires insufficient
contacting or incorrect connection
Between outdoor unit and indoor unit Check the continuity of the wires.
Check for looseness of the
connection screws. Check the
terminal nos.
Replacing wires repairing and
tightening the screws and the
correct wiring
Power source wiring for the outdoor
unit
Faulty PCB (outdoor unit, indoor
unit)
Disconnected wires to PCB Check the connections Correctly connect the wires
Faulty PCB — Replace PCB if faulty
Incorrect wiring
Disconnected wire; insufficient
contacting
Check the continuity and the
looseness of connection screws
Replacing wires, repairing and
tightening the screws
Incorrect wiring Check the terminal Nos. Correctly connect the wires
N O T E
• *1)
PCB1 output voltage
Voltage
Vcc 12 – GND2 12 VDC
Vcc 05 – GND1 5 VDC
Vcc 15 – GND1 15 VDC
Vcc 24 – GND1 24 VDC
Vcc 12T– GND1 12 VDC
8 Troubleshooting
214
SMGB0060 rev. 1- 12/2010
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