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Troubleshooting Service Manual Check item Action (Turn OFF the main switch) Measure the voltage using the tester Supply the power 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 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 Measure input voltage Replace transformer Phenomenon Cause Power failure or no power supply Blown out fuse for the power source or activation of the outdoor unit breaker Blown out fuse for control circuit or activation of outdoor unit breaker Faulty transformer Disconnected wires insufficient contacting or incorrect connection Faulty PCB (Outdoor unit, indoor unit) Incorrect wiring Between outdoor unit and indoor Check the continuity of the wires. unit Check for looseness of the connection screws. Power source wiring for the Check the terminal nos. outdoor unit Disconnected wires to PCB Check the connections Correctly connect the wires Faulty PCB - Replace PCB if faulty 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 *1) PCB1 output voltage Vcc 12 - GND2 Vcc 05 - GND1 Vcc 15 - GND1 Vcc 24 - GND1 Vcc 12T - GND1 Replacing wires repairing and tightening the screws and the correct wiring Voltage 12VDC 5 VDC 15 VDC 24 VDC 12 VDC 144 SMGB0043 rev.1 - 04/2010
