Mitsubishi Electronics MSY-A24NA, MSY-A15NA Troubleshooting check table, Indicates abnormalities

Models: MSY-A15NA MSZ-A09NA MSZ-A17NA MSZ-A12NA MSZ-A24NA MSZ-A15NA MSY-A24NA MSY-A17NA

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8-4. Troubleshooting check table

Before taking measures, make sure that the symptom reappears for accurate troubleshooting.

When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.

 

Lighted

·Flashing of OPERATION INDICATOR lamp (left-hand side lamp)

OPERATION INDICATOR

indicates abnormalities.

Blinking

 

 

 

Not lighted

 

No.

Abnormal

Operation indicator lamp

Symptom

Condition

Correspondence

 

point

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

Mis-Wiring

0.5-second ON

 

• Refer to 8-6.D"How to check

 

 

and outdoor

The serial signal from the outdoor unit is not

1

or serial

 

mis-wiring and serial signal

 

unit do not

received for a maximum of 6 minutes.

 

signal

 

error".

 

 

operate.

 

 

 

 

 

 

 

 

0.5-second OFF

 

 

 

 

Outdoor

 

 

 

• Check the blinking pattern of

 

control

 

 

It cannot properly read data in the nonvolatile

 

system

 

Outdoor unit

the LED on the inverter P.C.

 

 

memory of the inverter P.C. board or the

2

MSZ-A09/12

Left lamp lights up

board or the outdoor

does not

outdoor electronic control P.C. board.

 

MSZ-A15/17

 

operate.

 

electronic

 

 

 

control P.C. board.

 

MSY-A15/17

 

 

 

 

 

 

 

 

 

Indoor coil

Left lamp flashes.

 

 

 

 

thermistor

 

 

 

 

2-time flash

Indoor unit

The indoor coil or the room temperature

• Refer to 8-7.the

 

 

3

 

 

and outdoor

thermistor is short or open circuit.

characteristics of indoor coil

Room

 

unit do not

 

thermistor, and the room

 

tempera-

2.5-second OFF

operate.

 

temperature thermistor.

 

ture

 

 

 

 

 

 

 

 

 

thermistor

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

 

3-time flash

The rotational frequency feedback signal is

• Refer to 8-6.A"Check of

 

Indoor fan

 

and outdoor

4

 

not emitted during the indoor fan operation.

motor

 

unit do not

indoor fan motor".

 

 

 

 

 

 

operate.

 

 

 

 

2.5-second OFF

 

 

 

 

Indoor

Left lamp flashes.

Indoor unit

It cannot properly read data in the nonvolatile

 

 

4-time flash

 

 

and outdoor

• Replace the indoor electronic

5

control

 

memory of the indoor electronic control P.C.

 

unit do not

control P.C. board.

 

system

 

board.

 

 

operate.

 

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

It consecutively occurs 3 times that the

• Refer to "How to check of

 

Outdoor

5-time flash

 

inverter/ compressor".

6

power

 

and outdoor

compressor stops for overcurrent protection or

Refer to outdoor unit service

 

unit do not

start-up failure protection within 1 minute after

 

system

 

manual.

 

 

operate.

start-up.

 

 

2.5-second OFF

• Check the stop valve.

 

 

 

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

 

6-time flash

Indoor unit

The outdoor thermistors short or open circuit

• Refer to "Check of outdoor

 

Outdoor

 

and outdoor

thermistor".

7

 

unit do not

during the compressor operation.

Refer to outdoor unit service

thermistors

 

 

 

operate.

 

manual.

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

• Replace the inverter P.C.

 

Outdoor

7-time flash

It cannot properly read data in the nonvolatile

board or the outdoor

 

and outdoor

8

control

 

memory of the inverter P.C. board or the

electronic control P.C. board.

 

unit do not

 

system

 

outdoor electronic control P.C. board.

Refer to outdoor unit service

 

 

operate.

 

 

2.5-second OFF

 

manual.

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

• Confirm the abnormality in

 

Other

14-time flash

An abnormality other than above mentioned is

9

 

and outdoor

detail using the failure mode

abnormality

 

unit do not

detected.

recall function for outdoor

 

 

2.5-second OFF

operate.

 

unit.

 

 

 

 

 

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Mitsubishi Electronics MSY-A24NA, MSY-A15NA, MSY-A17NA, MSZ-A17NA Troubleshooting check table, Indicates abnormalities

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.

The MSY-A series, including the MSY-A17NA and MSY-A24NA, is designed for both cooling and heating. They feature inverter technology, which optimizes energy use by adjusting compressor speed based on demand, resulting in significant energy savings. The units come equipped with high-performance filters that capture dust and allergens, ensuring cleaner air.

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.

On the other hand, the MSZ-A models, which include the MSZ-A15NA, MSZ-A24NA, and MSZ-A12NA, are wall-mounted indoor units that complement the MSY outdoor models. With their sleek design, they blend seamlessly into any interior decor. The MSZ-A units also utilize inverter technology, enhancing energy efficiency and providing fast cooling and heating performance.

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.

All Mitsubishi MSY and MSZ models have been built with proactive environmental considerations, complying with high energy efficiency standards. They contribute to lower electricity bills and reduced carbon footprints. Furthermore, their compact design ensures easy installation in various settings without sacrificing performance.

In summary, Mitsubishi Electronics' MSY-A17NA, MSY-A24NA, MSZ-A15NA, MSZ-A24NA, and MSZ-A12NA models stand out in the competitive HVAC market. With features like inverter technology, advanced air purification, and user-friendly controls, these air conditioners deliver outstanding performance, comfort, and reliability while promoting energy efficiency and sustainability.