The cooling operation or heating operation does not operate. (LED display: 00)

C Check of R. V. coil

When heating operation does not work. Start

1.Disconnect the lead wire leading to the compressor.

2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION (HEAT operation) starts.

Is there voltage of 230V AC between pin1 and

No

pin 2 at connector CN913?

 

Yes

 

Turn off power supply of indoor and outdoor unit.

1. Turn off power supply of indoor and outdoor unit, and disconnect the connector (CN851, CN852) in the electronic control P. C. board.

2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION

(HEAT operation) starts.

Disconnect the connector CN913 in noise filter P. C. board, and measure the resistance of R. V. coil to check the integrity.

Yes

Replace the 4-way valve

No

Replace the R. V. coil

Is there voltage 12V DC between

No

 

Replace the electronic

the connector CN852 pin 1 (+)

 

 

 

control P. C. board.

and pin 5 (-)?

 

 

 

 

 

 

 

 

Yes

Replace the noise filter P. C. board.

When cooling operation does not work. Start

1.Disconnect the lead wire leading to the compressor.

2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION (COOL operation) starts.

Is there voltage of 230V AC between pin1 and

No

 

Replace the 4-way valve

pin 2 at connector CN913?

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

1.Turn off power supply of indoor and outdoor unit, and disconnect the connector (CN851, CN852) in the electronic control P. C. board.

2.Turn on power supply to the indoor and outdoor unit, three minutes later EMERGENCY OPERATION

(COOL operation) starts.

Is there voltage 12V DC between the connector CN852 pin 1 (+) and CN851 pin 5 (-)? W1

Yes

No

Replace the noise filter P. C. board.

W1 If the connector CN913 is not connected or R. V. coil is open, voltage occurs between terminals even when the control is OFF.

Replace the electronic control P. C. board.

29

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Mitsubishi Electronics MXZ-24UV When heating operation does not work. Start, When cooling operation does not work. Start

MXZ-24UV - E2, MXZ-24UV specifications

Mitsubishi Electronics has established itself as a leader in the HVAC (heating, ventilation, and air conditioning) industry with its MXZ-24UV and MXZ-24UV - E2 models. These multi-zone heat pump systems are designed to provide exceptional efficiency, comfort, and versatility for residential and commercial applications.

One of the main features of the MXZ-24UV is its ability to effectively cool and heat multiple rooms simultaneously. This system allows for the connection of up to four indoor units, enabling users to customize the climate in different spaces while maintaining energy efficiency. This zoning capability ensures you can maintain the perfect temperature in each room according to the occupants' preferences.

The MXZ-24UV incorporates advanced inverter technology, which allows the compressor to adjust its speed based on the required heating or cooling demand. This results in reduced energy consumption compared to conventional systems, providing significant savings on energy bills while also promoting a more consistent indoor temperature. The inverter-driven compressor operates quietly and efficiently, making it a suitable choice for residential areas.

Additionally, these models are equipped with a range of smart technologies. The built-in Wi-Fi capability allows homeowners to control the system remotely using a smartphone or tablet. This feature adds convenience and flexibility, enabling users to adjust settings from anywhere, ensuring their space is at the desired temperature upon arrival.

Durability is another essential characteristic of the MXZ-24UV and MXZ-24UV - E2 models. Mitsubishi has designed these units to withstand various weather conditions, enhancing longevity and reliability. The units feature a robust construction that minimizes wear and tear while ensuring dependable performance year after year.

Moreover, the system has a variety of indoor unit options, including wall-mounted, ceiling-mounted, and floor-mounted designs. This versatility makes it easy to integrate into different architectural styles and preferences, ensuring both aesthetics and functionality.

In summary, the Mitsubishi Electronics MXZ-24UV and MXZ-24UV - E2 models are designed for those seeking energy efficiency, flexibility, and durability in a multi-zone heating and cooling system. With advanced inverter technology, smart home capabilities, and a range of indoor unit styles, these systems offer exceptional comfort while minimizing energy costs, making them a top choice in the HVAC market.