Mitsubishi Electronics MXZ-24UV User Manual download pdf (Page 24)

12 TROUBLESHOOTING

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 on this page and the check table on page 25, 26.

Lead wiring

Housing point

12-1. 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 unit, and then after con-

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

2) Be sure to unplug the power cord before removing the front panel, the cabinet, the top panel, and the electronic con-

trol P.C. board.

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

components.

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

12-2. Instruction of troubleshooting

Operation start

Check the outdoor unit

LED indicator

A Check of power supply

See page 28.

• Indoor unit

serial signal

error

B Check of

serial signal

See page 28.

• Cool or HEAT

opereation only

C Check of

R.V.coil

See page 29.

• When cooling,

room does not

cool.

E Check of

inverter,

compressor

See page 30.

• When cooling, heat

exchanger of

non-operating indoor

unit frosts.

•When heating, non

operating indoor unit

gets warm.

D Check of LEV

See page 30.

• When cooling,

dew drops in the

non-operating

indoor unit

Check of mis-

piping.

• When heating,

room doed not get

warm.

E Check of

inverter,compressor

See page 30.

Check mis-piping

Shortage of capacity

Refer to indicator list

See page 25, 26.

OFF

"00"

• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit.

Then, check the outdoor unit with referring to this page.

Display other than "00"

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Mitsubishi Electronics MXZ-24UV User Manual Page 24

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