Outdoor fan motor does not operate.

I Check of outdoor fan motor

Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor.

Is the outdoor fan motor normal?

 

 

 

 

 

Replace the outdoor fan motor.

(Refer to 10-4.)

No

 

 

Yes

 

 

 

 

 

 

 

 

Replace the inverter P.C. board.

Inverter does not operate.

J Check of power supply

Disconnect the connector (CN61) between compressor and intelligent power module.

Turn ON power supply and press EMERGENCY OPERATION switch.

Does POWER lamp on the indoor

 

unit light up?

No

 

Yes

 

 

 

 

 

 

Is there voltage 280 ~ 370 VDC between DB61 (+) and DB61 (–) on

the inverter P.C. board?Yes (Refer to 10-6.1.)

No

Check the electric parts in main circuit.

Rectify indoor/ outdoor connecting wire.

Yes

Is there voltage 208 / 230 VAC between the indoor terminal block S1 and S2?

Dose LED on the inverter P.C. board light up or flash? (Refer to 10-6.1.)

Yes

If light up, OK.

If flash, refer to 10-3.

Replace the indoor No electronic control P.C.

board.

Replace the inverter No P.C. board.

280 ~ 370 VDC

DB61

Inverter P.C. board (Solder side)

26

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Mitsubishi Electronics MUZ-FD09NA service manual Check of outdoor fan motor, Check of power supply

MUZ-FD09NA specifications

The Mitsubishi Electronics MUZ-FD09NA is a highly efficient and versatile air conditioning unit designed for both residential and light commercial applications. This model is part of Mitsubishi's advanced range of split-system air conditioners which emphasize energy efficiency, comfort, and innovative technology.

One of the standout features of the MUZ-FD09NA is its energy efficiency. The unit boasts an impressive SEER (Seasonal Energy Efficiency Ratio) rating, which translates to reduced energy consumption and lower utility bills. This makes it an eco-friendly option for users looking to minimize their carbon footprint while enjoying comfortable indoor climates year-round.

The MUZ-FD09NA utilizes advanced inverter technology, which enables the compressor to adjust its speed based on the cooling or heating demand. This not only enhances comfort by maintaining a steady temperature but also significantly reduces energy consumption compared to traditional fixed-speed systems. Additionally, the inverter technology allows for quieter operation, making it ideal for use in bedrooms or study areas where noise can be disruptive.

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The MUZ-FD09NA is designed to operate in a wide range of temperatures, making it suitable for various climates. It can effectively provide cooling in the summer and heating in the winter, ensuring comfort throughout the year.

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