9 TROUBLESHOOTING

MSZ-FD09NA MSZ-FD12NA

9-1. CAUTIONS ON TROUBLESHOOTING

1.Before troubleshooting, check the following

1)Check the power supply voltage.

2)Check the indoor/outdoor connecting wire for miswiring.

2.Take care of the following during servicing

1)Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.

2)Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.

3)When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.

4)When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring

Housing point

3.Troubleshooting procedure

1)First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2)Before servicing check that the connector and terminal are connected properly.

3)When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.

4)When troubleshooting, refer to 9-2., 9-3. and 9-4.

4.How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

Remove the front lid and insert batteries. Then reattach the front lid.

Press RESET button with tip end of ball point pen or the like, and then use the remote controller.

Insert the negative pole of the

 

batteries first. Check if the polarity

RESET button

of the batteries is correct.

NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.

2.This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.

This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement.

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Mitsubishi Electronics MSZ-FD09NA Troubleshooting, Before troubleshooting, check the following, How to replace batteries
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MSZ-FD09NA specifications

The Mitsubishi Electronics MSZ-FD09NA is a wall-mounted split-type air conditioning unit that exemplifies the brand's commitment to efficiency, comfort, and advanced technology. This unit is designed to provide optimal cooling and heating solutions for residential and light commercial spaces, ensuring a comfortable environment year-round.

One of the standout features of the MSZ-FD09NA is its impressive energy efficiency rating. With a high SEER (Seasonal Energy Efficiency Ratio) rating, it utilizes less energy while maintaining high performance, which can lead to significant cost savings on utility bills. This unit adheres to modern energy conservation standards, making it an environmentally friendly choice that appeals to eco-conscious consumers.

The MSZ-FD09NA is equipped with Mitsubishi’s advanced inverter technology, which allows the compressor to adjust its speed according to the desired temperature. This ensures that energy is used efficiently and that fluctuations in temperature are minimized, resulting in enhanced comfort levels. The inverter technology also helps in reducing noise levels, creating a quieter operation compared to traditional HVAC systems.

Another remarkable characteristic of the MSZ-FD09NA is its sleek and modern design, which seamlessly integrates into various interior décors. The unit is available in a clean white finish, making it an unobtrusive addition to any room. Furthermore, it has a compact design that maximizes floor space while providing powerful performance.

The unit also features cutting-edge air filtration systems designed to purify indoor air. With a multi-stage filtration process, including a catechin filter and an anti-allergen enzyme filter, the MSZ-FD09NA effectively captures dust, allergens, and other airborne particles. This feature is particularly beneficial for those with respiratory issues or allergies, contributing to a healthier living environment.

In addition, the MSZ-FD09NA is compatible with smart control options. Users can control their air conditioner remotely through a smartphone app, making it convenient to adjust settings from anywhere. This smart technology allows for programmable scheduling, enabling users to optimize the unit's operation based on their lifestyle.

In summary, the Mitsubishi Electronics MSZ-FD09NA stands out due to its energy efficiency, advanced inverter technology, modern design, high-quality air filtration, and smart control options, making it an excellent choice for those seeking reliable heating and cooling solutions.
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