Meticulous intervention for a broken wall-mounted air conditioner
At AirGreen , we are often called upon to work on Midea wall-mounted air conditioners , which are very popular in Montreal for their efficiency and reliability. This service call in Ville Mont-Royal concerned a wall-mounted indoor unit whose customer reported a complete failure of the indoor fan accompanied by an intermittent error code .
Initial diagnosis: a targeted electrical fault
Upon arrival, we found that the unit was already partially disassembled: the front cover had been removed, and the main circuit board was visible. The temporary yellow support system ( Wall Bracket Lifty ) was used to hold the unit during the diagnostics—a practice we use to ensure safe disassembly without damaging the wall mounts.
After verification:
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Correct power supply .
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Stable indoor/outdoor communication .
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Control board showing a burning smell and several signs of overheating at the fan relay.
The diagnosis was clear: faulty main electronic board .
Steps of repair
We carried out a complete replacement of the original Midea motherboard , making sure to use a part compatible with the Blanc MUR24R32 range , very common in single-family residences in Ville Mont-Royal.
The technical steps included:
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Complete shutdown of the HVAC circuit.
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Removal of the faceplate and inspection of the temperature sensors and the drain probe.
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Disconnection and replacement of the electronic card.
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Cleaning the evaporator fins with compressed air and antibacterial product.
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Checking electrical connections and continuity testing.
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Gradual restart of the system to validate proper operation.
Results: comfort and efficiency restored
After the repair was completed, the Midea unit resumed perfect operation. The indoor fan was running normally, the blower temperature quickly dropped to 12°C , and communication with the outdoor unit was uninterrupted.
The customer immediately noticed improved airflow and reduced noise compared to before the failure. We also took care to perform a firmware update on the card to prevent any future communication errors.
AirGreen best practices and advice
We often take advantage of this type of intervention to remind our customers of some maintenance recommendations:
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Clean the filters at least once a month during the warm season.
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Check for condensation under the unit to prevent water leakage onto the wall.
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Have the HVAC system inspected every spring to extend the life of the compressor.
A well-maintained Midea wall-mounted air conditioner can easily last 15 years or more , while maintaining excellent energy efficiency.
Why trust AirGreen
Our team specializes in the repair of HVAC systems of all brands in Montreal, Laval, Longueuil, the North Shore and the South Shore .
Thanks to our trained technicians and our specialized tools (such as the temporary Wall Bracket Lifty supports visible in the photo), we intervene quickly, cleanly and without risk of damaging your wall installations.
Each service comes with a full diagnosis and a warranty on the replaced part , to ensure your peace of mind.
Conclusion: Another Midea air conditioner saved by AirGreen
This Midea wall-mounted air conditioner repair in Ville Mont-Royal perfectly illustrates our commitment to providing meticulous, safe, and sustainable service. Thanks to our team's rapid response, the customer regained the comfort of their home in less than two hours.
At AirGreen, we bring your HVAC systems back to life, one satisfied customer at a time.