Symptoms: Nothing is displayed on the remote controller 1

LED display of the indoor controller board

LED1 :

LED2 :

LED3 :

Diagnosis flow

Cause

Inspection method and

troubleshooting

 

 

Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit.

NO

AC 187V to AC 253V?

 

Check the voltage among L1 and L2

 

 

 

YES

on the terminal block (TB1) of the

 

 

 

outdoor power circuit board.

 

 

 

 

AC 187V to

AC 253V?

NO

• Troubles concerning

• Check the power wiring

 

 

 

power supply

to the outdoor unit.

 

 

 

 

 

 

 

 

 

 

 

• Check the breaker.

 

 

YES

 

 

 

Check the voltage between S1 and S2 on the terminal block (TB1) of the outdoor unit which is used to connect the indoor unit and the outdoor unit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC 187V to

AC 253V?

NO

• Check the wiring of the

 

 

 

 

 

 

 

• Bad wiring of the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outdoor controller

outdoor unit.

 

 

 

 

 

 

YES

 

 

board

• Check if the wiring is bad.

 

 

 

 

 

 

 

 

• The fuses on the

Check if the fuses are blown.

Check the voltage of indoor

 

 

 

 

 

 

 

outdoor

The fuses on the outdoor

controller board (CN2D).

 

 

 

 

controller circuit

controller circuit board will

 

 

 

 

 

 

 

 

 

board are blown.

be blown when the indoor

 

 

 

 

 

 

 

 

 

 

/outdoor connecting wire

 

 

 

 

 

 

 

 

 

 

short-circuits.

 

 

 

 

 

 

 

 

 

• Bad wiring of the

• Check if miswiring, breaking

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

outdoor controller

or poor contact is causing this

DC 12V to

DC 16V?

 

 

 

 

board

problem. Indoor/outdoor

 

 

 

 

 

 

• The fuses on the

connecting wire is polarized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outdoor

3-core type. Connect the

 

NO

 

 

 

controller circuit

indoor unit and the outdoor

 

 

 

 

 

 

 

 

 

board are blown.

unit by wiring each pair of

Check the voltage of the unit after

 

 

 

 

 

S1, S2 and S3 on the both

 

 

 

 

 

side of indoor/outdoor

removing the indoor power board

 

 

 

 

 

 

 

 

 

 

terminal blocks.

(CN2S).

 

 

 

 

 

 

 

 

 

• Defective indoor

• Replace the indoor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

controller board

controller board.

DC 12V to

DC 16V?

 

YES

 

 

• Miswiring, breaking

• Check if there is miswiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or poor connection of

or breaking of wire.

 

NO

 

 

indoor/outdoor

 

 

 

 

connecting wire

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Defective indoor

• Replace the indoor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

power board

power board.

48

Page 47 Page 49
Page 48
Image 48
Mitsubishi Electronics PUY-A30NHA2-BS Outdoor power circuit board, AC 253V? Troubles concerning, Fuses on, Board are blown
Page 47 Page 49

PUZ-A36NHA2-BS, PUY-A12NHA2, PUY-A42NHA2-BS, PUY-A30NHA2, PUZ-A36NHA2 specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, and their range of air conditioning units, including the PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2, exemplifies their commitment to innovation and energy efficiency. These models are designed to provide optimal climate control for both residential and commercial applications, ensuring comfort throughout the year.

One of the defining features of these models is their advanced inverter technology, which allows for precise temperature control and reduced energy consumption. The inverter technology adjusts the compressor speed according to the cooling load, significantly lowering operating costs compared to traditional fixed-speed systems. This means that users can enjoy consistent comfort without worrying about surging energy bills.

The PUY and PUZ units come equipped with powerful indoor and outdoor components that enable efficient heat exchange. These systems provide excellent performance even in extreme weather conditions, with reliable operation at low ambient temperatures. This capability ensures that you can maintain a comfortable environment, no matter the season.

Additionally, the models are designed with quiet operation in mind. The outdoor units incorporate noise-reduction technology, ensuring that the systems operate at minimal sound levels. This is especially beneficial for residential areas or office environments, where maintaining a peaceful atmosphere is crucial.

Mitsubishi Electronics has also integrated smart technology into these units. With options for remote control via Wi-Fi, users can manage their air conditioning settings from anywhere, using their smartphones or tablets. This integration enhances user convenience and allows for more efficient scheduling and energy management.

These models are also known for their environmentally friendly refrigerants, such as R410A, which contribute to lower global warming potential and align with modern sustainability practices. By choosing Mitsubishi's PUY and PUZ series, consumers not only prioritize their comfort but also contribute to environmental conservation.

In summary, the Mitsubishi Electronics PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2 air conditioning units are equipped with cutting-edge technology, offering energy efficiency, quiet operation, and smart functionality. Whether for residential or commercial use, these units are designed to meet the demands of modern climate control while prioritizing energy savings and sustainability.
Top Page Image Contents