The unit does not operate with the remote controller.

Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.

C Check of indoor electronic control P.C. board and indoor fan motor

Turn OFF the power supply.

Remove indoor fan motor connector CN211 and

vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply.

Yes

Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch?

No

Turn OFF the power supply.

Measure the resistance between CN211 3 and 4 of the indoor fan motor connector.

Measure the resistance of the horizontal vane motor coil.

Refer to 8-5.

Replace the indoor electronic control P.C. board.

Yes

Are the varistor(NR11) burnt No and the fuse(F11) blown?

Short/open circuit:

Replace the indoor fan motor.

Short/open circuit:

Replace the horizontal vane motor and the indoor electronic control P.C. board.

Check both “parts side” and “pattern side” of the indoor electronic control P.C. board visually.

Be sure to check both the fuse and the varistor in any case.

No

Is the fuse(F11) blown only?

Yes

Measure the resistance between 1(+) and 3(-) of the indoor fan motor connector (to CN211 on the indoor electronic control P.C. board) . w1,w2

w1. The fan motor connector's1 lead wire is red, whereas 3 is black.

w2. Connect "+" of the tester to fan motor connector's1 lead wire, and "-" to 3 lead wire, otherwise the resistance cannot be measured properly.

Is the resistance 1M"

No

 

Replace the indoor electronic control

or more?

 

 

P.C. board and the indoor fan motor.

 

 

 

 

 

 

 

Yes

Replace the indoor electronic control P.C. board

Measure the resistance of cement resistance R111 on the indoor electronic control P.C. board.

Is the resistance approx. 4"?

Yes

No

Replace the indoor electronic control P.C. board and the indoor fan motor.

Indoor electronic control P.C.Board

Varistor(NR11)

Fuse(F11)

CN211

Replace the indoor electronic control P.C. board.

20

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Mitsubishi Electronics MSZ-A15NA, MSY-A24NA, MSY-A15NA, MSY-A17NA, MSZ-A17NA, MSZ-A12NA Indoor electronic control P.C.Board

MSY-A15NA, MSZ-A09NA, MSZ-A17NA, MSZ-A12NA, MSZ-A24NA specifications

Mitsubishi Electronics is a renowned name in the HVAC (heating, ventilation, and air conditioning) industry, known for innovative, efficient air conditioning solutions. The MSY-A17NA, MSY-A24NA, MSZ-A15NA, MSZ-A24NA, and MSZ-A12NA models exemplify this legacy, offering advanced features and cutting-edge technology. These models cater to various room sizes and requirements, providing comfortable and reliable climate control.

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Additionally, the MSY models incorporate a quiet operation mode, making them ideal for residential use. The user-friendly remote control allows for easy adjustments, while the programmable timer adds convenience for scheduling operation times to align with the user's lifestyle. Both models are built with durability in mind, featuring rust-resistant cabinets and high-quality components that extend the lifespan of the unit.

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One notable feature of the MSZ-A series is the advanced air purification system, which goes beyond standard filtration. It includes technologies that neutralize odors and harmful gases, creating a healthier indoor environment. The models also come with a quiet operation mode, making them suitable for bedrooms and other quiet spaces.

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