F Check of compressor start failure

Confirm that 1~4 is normal. •Electrical circuit check

1.Contact of lead wire leading to compressor

2.Output voltage of the outdoor electronic control P.C. board and balance of them (See 10-5.)

3.Direct current voltage to the outdoor electronic control P.C. board

4.Voltage between outdoor terminal block S1-S2

Does the compressor run for 10 seconds or more after it starts?

No

After the compressor is heated with a drier, does the compressor start? 1

Yes

 

 

Check the refrigerant circuit.

Yes

 

Check the stop valve.

 

 

 

 

 

Replace the compressor.

No

 

Compressor start failure. Activate pre-heat control. (Refer to 9-1. "PRE-HEAT CONTROL")

1

Heat the compressor with

a drier for about 20 minutes. Do not recover refrigerant gas while heating.

Heating part

When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit gets warm.

G Check of LEV

Turn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.

Is "click - click" sound heard?

Or, do you feel vibration of the LEV coil with a hand? No

Disconnect the connector CN795.

Is there normal resistance to LEV coil?

No

Replace the LEV coil.

 

 

Normal

Yes

 

 

 

Replace the outdoor electronic

Yes

 

control P.C. board.

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Mitsubishi Electronics U1, MUZ-D36NA, MUY-D36NA, MUZ-D30NA, MUY-D30NA Check of compressor start failure, Check of LEV

MUY-D36NA, MUZ-D30NA, U1, MUY-D30NA, MUZ-D36NA specifications

Mitsubishi Electronics has long been at the forefront of innovation in heating and cooling solutions, and its latest lineup of multi-zone air conditioning units—MUZ-D36NA, MUY-D30NA, U1, MUZ-D30NA, and MUY-D36NA—reflects this commitment to quality and efficiency. Designed for both residential and commercial applications, these units offer advanced features that enhance comfort and energy savings.

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