Mitsubishi MSH-24NV Service Manual download pdf (Page 23)

TROUBLESHOOTING

MCFH-24NV - MUCFH-24NV -

10-1. Cautions on troubleshooting

10-1-1. Before troubleshooting, check the followings:

1) Check the power supply voltage.

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

10-1-2. Take care the followings during servicing.

1) Be sure to unplug the power cord before removing the air inlet grille, the front panel, the cabinet, the top panel, and

the electronic control P.C. boards.

2) When removing the electronic control 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.

10-1-3. 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) 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.

3) When troubleshooting, refer to the flow chart and the check table on page 24.

10-1-4 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 con-

troller normally, discharge the remote controller 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.

Insert the negative pole

of the batteries first.

Check if the polarity of

the battereis is correct.

RESET button

1 Remove the back lid and replace batteries.

Then re-attach the back lid.

2 Press the RESET button.

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Mitsubishi MSH-24NV Service Manual Page 23