Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Disconnected wires, insufficient
contacting or incorrect connection
Between control PCB, inverter PCB
and FANM
Check the continuity of wires.
Check for looseness of the
connection screws. Check the
connection No.
Replacing wires, repairing,
tightening screws and incorrect
wiring
Power source wiring for the outdoor
unit
Faulty PCB (PCB1 for the control,
PCB for the inverter)
Disconnected wires to PCB Check the connections Repair the wiring connections
Faulty PCB Replace PCB if faulty
Incorrect wiring
Disconnected wires;
insufficient contacting
Check the continuity.
Check for looseness of connection
screws
Replacing wires, repairing,
tightening screws
Incorrect wiring Check the connection nos. Correctly connect the wires
8 Troubleshooting
219
SMGB0060 rev. 1- 12/2010
8
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