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Réparation d’une thermopompe murale Midea à Ville Mont-Royal
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Repair of a Midea wall-mounted heat pump in Ville Mont-Royal

Rapid intervention to restore the comfort of a Montreal duplex

At AirGreen , we regularly receive service calls related to wall-mounted heat pumps in residential buildings in Montreal. Recently, our team worked on a brick duplex in Ville Mont-Royal , where a Midea wall-mounted heat pump was showing signs of failure. The outdoor unit, installed on a side wall about one meter above the ground, was no longer producing enough heat, despite regular maintenance performed the previous year.

Symptoms observed by the client

The customer contacted us after noticing several anomalies:

  • The indoor unit was blowing lukewarm air, even in heating mode.

  • The Midea outdoor compressor seemed to be working intermittently.

  • A slight accumulation of frost was forming around the refrigeration connections.

  • A sudden increase in electricity consumption was noted on the last bill.

These clues suggested a problem with the refrigeration circuit or the outside temperature sensor .

Complete on-site diagnosis

Our certified technician first performed a visual inspection and measured the refrigerant pressures. Here are the main steps of the diagnosis :

  1. Compressor and heat exchanger inspection : the outdoor fan was working properly, but the discharge pressure was abnormally low.

  2. Checking the electrical connections : no signs of short circuit or overheating on the terminals.

  3. Defrost cycle analysis : The system was not entering automatic defrost mode, which explained the ice buildup.

  4. Probe Test : The outdoor probe showed inconsistent resistance compared to ambient temperature.

After these checks, our team concluded that the defrost sensor was faulty , preventing the system from correctly regulating the temperature of the exchanger.

Repair: precision and efficiency

We replaced the defective sensor with an original Midea part, matching the exact model of the heat pump. Then:

  • We reset the electronic control module to clear the errors.

  • A forced defrost test was performed to confirm proper compressor and fan response.

  • The pressure values ​​were readjusted after a light top-up of R410A refrigerant.

  • Finally, we cleaned the suction grid and checked that the condensates were draining properly.

Result

As soon as the intervention was completed, the unit resumed optimal operation:

  • Stable hot air from the first minute.

  • Automatic defrosting in operation.

  • Reduced noise level.

  • Standardized power consumption.

The customer could immediately see the difference: the Midea heat pump was back to its primary role – maintaining constant thermal comfort while saving energy.

Why Choose AirGreen for Your HVAC Repairs

This repair perfectly illustrates our approach: rigorous diagnosis, targeted repair and total transparency . At AirGreen, we:

  • We only use certified original parts .

  • We work on all major brands: Midea, Fujitsu, Gree, Sharp, Mitsubishi, LG, Zephyr, Trane , and many more.

  • We cover all of Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore .

  • We guarantee our interventions to provide lasting peace of mind to each client.

Our certified technicians are trained to work on wall-mounted, central, multi-zone and VRF systems , with particular attention to performance and safety.

Maintenance tips to prevent this type of breakdown

To avoid a similar situation happening again, we recommend:

  • A complete cleaning of the internal filters every 6 to 8 weeks.

  • An annual system inspection by an AirGreen professional before each heating season.

  • Clearance of the external compressor (snow, leaves, dust) to ensure optimal airflow.

  • Periodic checking of temperature probes during maintenance.

These simple actions extend the life of your heat pump while maintaining its maximum energy efficiency.

In conclusion

Thanks to our quick and methodical intervention, the Midea heat pump in this duplex in Ville Mont-Royal has regained its full performance. The client now benefits from optimal thermal comfort , without wasting energy or risk of premature breakdown.

At AirGreen , we put our expertise at the service of each home to ensure your HVAC system always operates at its best , no matter the season.