40
TROUBLESHOOTING
11
11-1 Cautions on troubleshooting
1. Before troubleshooting, check the followings:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the followings during servicing.
1) Be sure to unplug the power cord before removing the front panel, the cabinet, the top panel, and the P.C. boards.
2) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
3) When connecting or disconnecting the connectors, hold the housing of the connector, DO NOT pull the lead wires.
3. Troubleshooting procedure
1) First, check if the POWER LAMP on the indoor unit is flashing to indicate an abnormality. To make sure, check the
abnormality indication for 2 or 3 times before starting service work.
2) If the P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for
bursting and discoloration.
3) When troubleshooting, refer to the flow chart and the check table on page 38.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, the remote controller can not be repaired only by the battery replacement. To operate the remote
controller normally, replace the batteries in the following order.
This remote controller has the reset button. After refilling new batteries, press the reset button with tip end of ball point
pen or the like, and then use the remote controller.
Housing point
RESET BUTTON
Lead wiring
3. Caution for the outdoor unit repair service
1) Do not load on the P.C.board cover.
2) Since every P.C.board circuit links directly with
power supply 220~240V AC, do not short the
P.C.board and metal section on servicing. Also
if touch the parts on the P.C.board, it may cause
an electric shock.
3) When closing the P.C.board cover, prevent a
foreign matter or dust from coming inside the
P.C.board.
Be careful at voltage measurement
Cover
Relay P.C. board
Electronic control P.C. board
MSZ-A09RV -
MSZ-A12RV -
E1
E1
