Mitsubishi MCFZ-A18WV Service Manual download pdf (Page 30)

3030

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.

To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2) Before servicing check that the connector and terminal are connected properly.

3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and

the components for bursting and discoloration.

4) When troubleshooting, refer to the flow chart on page 31 and the check table on page 32 and 33.

10-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

2. Take care the following during servicing.

1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after

confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the

electronic control P.C. board.

3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.

4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the

components.

5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Housing point

Lead wiring

MUZ-A18YV -

MUZ-A24YV -

MUZ-A26YV -

TROUBLESHOOTING

OB346A --1qxp 04.6.14 1:20 PM Page 30

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 51 52

No comments

Mitsubishi MCFZ-A18WV Service Manual Page 30