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Réparation d’une thermopompe murale Midea à Laval-des-Rapides
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Repair of a Midea wall-mounted heat pump in Laval-des-Rapides

A disassembled unit for a complete diagnosis

At AirGreen , we were called to intervene in an apartment in the Laval-des-Rapides district, where a Midea wall-mounted heat pump had stopped working properly. The customer had noticed that his unit was no longer blowing air, although the lights indicated normal startup. In order to understand the source of the problem, our team carried out a complete disassembly of the indoor unit , an essential step to inspect the internal components and perform an accurate diagnosis.

At first glance, the customer had already removed the front panels and air filters in an attempt to find the cause. However, the root of the problem lay deeper, in the internal circuits and the blower motor.

Diagnosis: A fan motor blocked by dust accumulation

After removing the front cover, our technicians noticed a significant buildup of dust and lint on the fan impeller and in the motor compartment. This obstruction prevented the blower wheel from spinning freely, causing an overload on the motor.

The symptoms matched perfectly:

  • Operation indicator light on.

  • External compressor operational.

  • No airflow coming out of the wall unit.

  • Slight knocking sound from the engine when starting.

By measuring the supply voltage, we confirmed that the electronic card was sending the start signal, but that the blower motor (DC inverter) remained stationary.

Intervention: cleaning, lubrication and testing of the engine

For this type of breakdown, immediate replacement is not always necessary. After disconnecting the motor from the main circuit, we undertook a complete mechanical cleaning :

  1. Removing the housing and turbine.

  2. Vacuuming debris and fine dust using a HEPA vacuum cleaner.

  3. Cleaning the evaporator fins with a biodegradable solution.

  4. Application of specialized lubrication to the engine bearings.

  5. Power-off test of the motor to verify free manual rotation.

After reassembly, we restarted the heat pump: the blower immediately started, confirming that the mechanical blockage was the main cause.

Additional check: control board and temperature probes

To prevent any recurrence, we carried out a preventive inspection of the electronic components . The control board and thermal sensors were checked and found no damage. However, we did update the Midea board firmware to improve motor management and prevent unexpected shutdowns in the event of increased resistance.

This often overlooked step ensures greater performance stability and extends the system's lifespan.

Result: restored comfort and optimal functioning

Once the heat pump was restarted, we checked the complete performance:

  • Blowing temperature: 11°C in air conditioning mode.

  • Noise level: 23 dB , fully compliant with Midea standards.

  • Stable compression cycle without premature cut-off.

The customer noticed a significant improvement in airflow and a rapid return to normal comfort. The intervention also reduced energy consumption by nearly 10%, since the motor was no longer forced.

AirGreen Tips to Avoid Blower Blockages

At AirGreen, we remind our customers in Laval, Montreal, and the South Shore that dust is one of the worst enemies of wall-mounted systems. To prevent this type of breakdown, our technicians recommend:

  • Clean the filters every two months , especially during the hot season.

  • Schedule an annual professional service to inspect the motor and electronic board.

  • Avoid obstructing the airflow with furniture or curtains near the unit.

  • Maintain a dry environment , as excessive humidity promotes the formation of sticky deposits on the turbine.

These simple actions ensure the longevity of the blower motor and maintain the energy performance of the system.

Recognized expertise in Laval-des-Rapides

This intervention illustrates AirGreen 's philosophy: to prioritize intelligent repairs over unnecessary replacements. Thanks to our in-depth knowledge of Midea, Fujitsu, Gree, Sharp, Hitachi , and other major brands, we can quickly diagnose even the most subtle faults.

Our service in Laval-des-Rapides is an integral part of our coverage across Greater Montreal, including Laval, Longueuil, the North Shore, and the South Shore . Every day, our teams respond with professionalism, speed, and technical precision to restore your residential comfort.