Mitsubishi Electronics MUZ-D36NA Check of R.V. coil MUZ-D30/36, Heating operation does not work

Models: MUY-D36NA MUZ-D30NA U1 MUY-D30NA MUZ-D36NA

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The cooling operation or heating operation does not operate.

CCheck of R.V. coil MUZ-D30/36

Heating operation does not work.

1.Disconnect the lead wire leading to the compressor.

2.3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode.

Is there voltage of 208 / 230 VAC between pin1

 

and pin 2 at connector CN912?

No

 

Yes

 

 

 

Turn OFF power supply of indoor and outdoor unit.

1.Turn off power supply of indoor and outdoor unit, and discon- nect the connector CN781 in the outdoor electronic control P.C. board.

2.3 minutes after turning ON the power supply, start EMER- GENCY OPERATION in HEAT mode.

Disconnect the connec-

tor CN912 in noise filter No Replace the R.V. coil. P.C. board. Is there normal

resistance to R.V. coil?

Yes

Replace the 4-way valve.

Is there voltage 12 VDC be-

tween the connector CN781 No pin 5 (+) and pin 3 (-)?

Yes

Replace the noise filter P.C. board.

Replace the electronic control P.C. board.

Cooling operation does not work.

1.Disconnect the lead wire leading to the compressor.

2.3 minutes after turning on the power supply, start EMERGENCY OPERATION in COOL mode.

If the connector CN912 is not connected or R.V. coil is open, voltage occurs between terminals even when the control is OFF.

Is there voltage of 208 / 230 VAC between pin1

 

 

 

 

 

Replace the 4-way valve.

and pin 2 at connector CN912?

No

 

 

 

1.Turn OFF power supply of indoor and outdoor unit, and disconnect the connector CN781 in the outdoor electronic control P.C. board.

2.3 minutes after turning ON the power supply, start EMER- GENCY OPERATION in COOL mode.

Is there voltage 12 VDC between the connector

 

 

 

 

 

Replace the noise filter P.C. board.

CN781 pin 5 (+) and pin 3 (-)?

No

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Replace the outdoor electronic control P.C. board.

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Mitsubishi Electronics MUZ-D36NA, MUY-D36NA, U1, MUZ-D30NA Check of R.V. coil MUZ-D30/36, Heating operation does not work

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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