Mitsubishi MXZ-32SV Service Manual download pdf (Page 33)

Check of HPS

Infinity

Yes

Start

1. Disconnect the connector CN722 in the electronic control P. C. board.

2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turnd off.

Check the resistance between

each terminal?

Return CN722 to former.

Turn on power supply to the indoor and outdoor unit.

3 minutes lator, EMERGENCY OPERATION starts.

Is HPS protection displayed

immediately after compressor

starts.

Replace HPS (63H1).

Replace the electronic control P. C. board.

Normal

The other cases

In the case that the indoor fan and outdoor fan operate but the compressor does not operate, it causes that the

high pressure switch can be operated once.

First of all, check the high pressure switch can be shorted, turn OFF the power and turn ON again 1 minute later.

Indoor unit dose not operate. (difference modes)

• When you try to run two indoor unit simultaneously, one for cooling and the other for heating, the unit which

transmits signal to the outdoor units earlier decides the operation mode. The other unit indicates as shown in

the figure below.

• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and

then turn them back ON.

• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that

the refrigerant gas continuously flows into the indoor unit even while it is not operating.

OPERATION INDICATOR

Lighting Flashing

• When the operation frequency does not go up from lowest frequency.

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Mitsubishi MXZ-32SV Service Manual Page 33