Service Manual

8. Troubleshooting
199
SMGB0079 rev.0 - 01/2013
8
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Power failure or power is not ON
Measure the voltage by means of
the tester
Supply the power
Blown out fuse for the power
source or activation of the outdoor
unit breaker
Short-circuit between the 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 short-circuit to ground
and replace the fuse
Faulty comp. motor
Measure the resistance between
the wires and the insulation resist-
ance
Replace the comp. and the fuse
Failure of outdoor unit fan motor
Measure resistance between wires
and insulation resistance
Replace the unit fan motor and
the fuse
Blown out fuse for control circuit or
activation of outdoor unit breaker
Short-circuit between the 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 mag-
netic switch for the comp. motor
Measure the resistance of coil
Replace the magnetic switch and
the fuse
Failure of outdoor unit fan motor
Measure the resistance between
the wires and the insulation resist-
ance
Replace the outdoor unit fan motor
and fuse
PCB1 Power circuit failure PCB1 Measure output voltage *1) Replace PCB1
Disconnected wires insufcient
contacting or incorrect connection
Between outdoor unit and indoor
unit
Check the continuity of the wires
Check for looseness of the con-
nection screws
Check the terminal Nos.
Replacing wires repairing and
tightening the Power source wir-
ing for the screws and the correct
wiring
Power source wiring for the screws
and the correct wiring 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; insufcient
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)Inthecasethattheendterminalresistance(DSW5-1)issetto OFF for H-LINK connection, set the end
terminalresistancetoONwhenCN8isdisconnected.SettheendterminalresistancetoOFFwhenCN8is
reconnected.
• *2)TransmissionSetting(SW1)
Item Setting Position
SW1 Left Side (for H-LINK/H-LINK II)
• *3)
PCB1 output voltage Voltage
Vcc 12 – GND2 12 VDC
Vcc 05 – GND1 5 VDC
Vcc 12 – GND1 12 VDC
Vcc 15 – GND1 15 VDC
Vcc 24 – GND1 24 VDC
Vcc 12T– GND1 12 VDC
• *4)Therotaryswitch(RSW2)isnotavailabledependingontheindoorunitmodel.