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Réparation d’une thermopompe murale Midea à Sainte-Thérèse
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Repair of a Midea wall-mounted heat pump in Sainte-Thérèse

A service call in the middle of winter: a heat pump blocked by ice

At AirGreen , we often receive urgent calls during the cold weather in Quebec. This time, our team went to Sainte-Thérèse , on the North Shore of Montreal , to work on a Midea wall-mounted heat pump with a common problem in winter: ice buildup on the outdoor unit , causing a loss of efficiency and a complete shutdown of the heating system.

The unit, installed on the rear wall of a single-family, light-colored brick home, showed clear signs of airflow blockage. The customer noticed that the heat pump was no longer producing the expected heat and that the fan seemed to be running slowly.

Accurate diagnosis and rapid intervention

Upon arrival, we carried out a complete inspection of the Midea outdoor unit . The initial findings:

  • A thick layer of ice covered the fan grill.

  • The automatic defrost cycle seemed to no longer be triggered.

  • The outside temperature sensor was sending incorrect data , preventing the system from switching to defrost mode.

After securing the work area and disconnecting the power, our technician disassembled the service panel to check the control board and thermal sensors . We then performed a continuity test and confirmed that the sensor was indeed faulty.

Sensor replacement and restart

Thanks to our stock of Midea parts available directly in our service vehicles, we were able to immediately replace the defrost sensor .

Then we launched a full test cycle:

  1. Activation of forced defrost mode.

  2. Observation of compressor and fan behavior.

  3. Check drainage and ice clearance.

In less than 20 minutes, the Midea heat pump was back to full operation. The customer immediately felt the difference: warm air was circulating throughout the house again and energy efficiency was returning to normal.

Preventing winter problems: our recommendations

To prevent this type of situation from happening again, we shared several practical tips with the client:

  • Regularly clear snow around the outdoor unit (at least 60 cm of clearance).

  • Ensure that the defrost drain is not blocked by ice.

  • Schedule annual preventative maintenance before winter to check sensors, refrigerant pressure, and the proper operation of automatic cycles.

We also recommended installing a raised wall mount to better protect the heat pump from snow accumulation on the ground—a practice we routinely incorporate into our winter installations on the North Shore and in Laval.

AirGreen expertise: local service and recognized know-how

This intervention at Sainte-Thérèse perfectly illustrates our approach:

  • Responsiveness in the middle of winter thanks to a mobile team.

  • Technical expertise on all brands including Midea, Gree, Fujitsu and Sharp .

  • Personalized advice to extend the life of HVAC systems.

At AirGreen , we don't just repair: we optimize each system to provide consistent comfort, even at -25°C.

Conclusion: a high-performance heat pump, ready for winter

Thanks to this quick and methodical intervention, our client's wall-mounted Midea heat pump in Sainte-Thérèse now operates smoothly and quietly. This repair has restored the thermal comfort of the home while reducing energy consumption .

For any HVAC service call in Montreal, Laval, Longueuil, on the North Shore or the South Shore , trust AirGreen — your specialist in the repair, maintenance and installation of wall-mounted and central heat pumps, all year round.

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