Mitsubishi MSZ-HC35VA Service Manual download pdf (Page 25)

10-1. CHANGE IN DEFROST SETTING

<JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to

11-6-1.)

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

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) Refer to 11-2. and 11-3.

11-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, 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.

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

10-2. PRE-HEAT CONTROL SETTING

PRE-HEAT CONTROL

When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside tempera-

ture. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 20°C

or below. When pre-heat control is turned ON, compressor is energized. (About 50 W)

<JK> When the JK wire of the inverter P.C. board is cut, pre-heat control is activated. (Refer to 11-6.1)

NOTE : When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.

Lead wiring

Housing point

Jumper wire Defrost ﬁ nish temperature (°C)

Soldered

(Initial setting)

None

(Cut)

SERVICE FUNCTIONS

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Mitsubishi MSZ-HC35VA Service Manual Page 25