No.

Symptom

LED indication

Abnormal point/

Condition

Correspondence

Condition

 

 

 

 

 

 

 

Outdoor unit

7-time flash

Low discharge tem-

Temperature of discharge temperature thermistor has been

•Refer to 10-5.

"Check of LEV".

18

operates.

2.5 seconds OFF

perature protection

122 °F (50 °C) or less for 20 minutes.

•Check refrigerant circuit and refrig-

 

 

 

 

 

erant amount.

 

 

 

8-time flash

PAM protection PAM:

The overcurrent flows into IGBT (Insulated Gate Bipolar tran-

This is not malfunction. PAM protec-

 

 

2.5 seconds OFF

Pulse Amplitude

sistor : TR821) or when the bus-bar voltage reaches 320 V or

tion will be activated in the following

19

 

 

Modulation

more, PAM stops and restarts.

cases;

 

 

 

 

 

1 Instantaneous power voltage drop

 

 

 

 

 

(Short time power failure)

 

 

 

 

 

2 When the power supply voltage is

 

 

 

 

 

high.

 

 

 

9-time flash

Inverter check mode

The connector of compressor is disconnected, inverter check

•Check if the connector of the com-

20

 

2.5 seconds OFF

 

mode starts.

pressor is correctly connected.

 

 

 

 

Refer to 10-5.

"How to check

 

 

 

 

 

inverter/ compressor".

 

 

 

 

 

 

 

21

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Mitsubishi Electronics MUZ-FD09NA service manual

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.

For air purification, the MUZ-FD09NA is equipped with a high-efficiency filtration system that removes dust, allergens, and other particles from the air. This feature is especially beneficial for individuals with allergies or respiratory issues, ensuring cleaner and healthier indoor air quality.

In terms of user convenience, the unit comes with a user-friendly remote control, allowing for easy adjustment of settings from a distance. Some models may also offer Wi-Fi capability, enabling users to control their air conditioning unit through a smart device, even when away from home.

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.

Furthermore, the unit features a compact and sleek design, allowing for easy installation in a variety of spaces without compromising aesthetics.

Overall, the Mitsubishi Electronics MUZ-FD09NA combines energy efficiency, advanced technology, and user-friendly features, making it a reliable choice for maintaining a comfortable indoor environment. Whether for residential or light commercial use, this air conditioning unit stands out as an effective solution for climate control needs.