Heat pump failure quickly resolved in Montreal building
At AirGreen , our technicians work every day in a variety of settings, from residential duplexes to typical Montreal rental buildings. On this day, our team was called to the Rosemont–La Petite-Patrie neighborhood to diagnose and repair a Midea wall-mounted heat pump installed on the rear facade of a brick building.
The context of the call
The owner of a second-floor unit contacted us after noticing that their heat pump had not been producing heat for several days. The outdoor compressor seemed active, but the air blown inside remained lukewarm , even in heating mode. This type of symptom is common on wall-mounted units when the defrost cycle or temperature sensor encounters an anomaly.
On-site diagnosis
Upon our arrival, we performed a complete visual inspection of the system. The outdoor unit, mounted on a brick wall typical of Montreal buildings , showed some signs of wear, including:
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Slight traces of oil at the refrigerant connection , indicating a potential micro-leak.
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External fan slightly unbalanced , causing a vibrating noise when starting.
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Accumulation of dust on the exchanger , limiting the efficiency of heat transfer.
After connecting our pressure gauges and probes, we confirmed a drop in pressure of the R410A refrigerant gas , a probable consequence of the observed microleak.
Steps of repair
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Complete recovery of remaining refrigerant , in order to comply with environmental standards.
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Precise location of the leak using an electronic detector and a tracer solution — it came from the flare connection of the suction pipe .
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Re-flare , tighten the nut to the appropriate torque and test with nitrogen under pressure for 30 minutes to ensure a seal.
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Complete cleaning of the outdoor unit , including the condenser and fan.
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Recharge the system with R410A according to the charge indicated by the manufacturer Midea.
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Calibration of the indoor temperature sensor to optimize the operation of the heating mode.
Final checks and results
After restarting the system, we performed several complete cycles (heating and cooling). The heat pump returned to optimal performance:
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Blown air temperature at 32°C in heating mode.
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Smooth and quiet defrost cycle.
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Stable power consumption in line with model specifications.
The owner was impressed by the speed and accuracy of our diagnosis. Thanks to this repair, the comfort of the home has been restored, and the risk of prolonged breakdowns in winter is now eliminated.
Best practices recommended by AirGreen
To extend the life of your Midea wall-mounted heat pump , we recommend:
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An annual professional inspection , especially before the cold season.
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Regular cleaning of the internal filters (every 4 to 6 weeks).
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Check the refrigerant pressure every two years to prevent micro-leaks.
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A minimum clearance of 30 cm around the condenser , to ensure good air circulation.
AirGreen expertise serving Montreal buildings
This intervention perfectly illustrates our expertise in complex environments such as Montreal's multi-unit buildings . Our technicians are familiar with the access constraints, specific electrical configurations and safety standards required to work in these old, typically brick buildings.
We service all brands of heat pumps and wall-mounted air conditioners— Midea, Fujitsu, Gree, Sharp, Lennox, Trane, Goodman , and many others—using genuine parts and procedures that comply with manufacturer recommendations .
Conclusion
Thanks to a rigorous approach and in-depth expertise, AirGreen has enabled this Rosemont–La Petite-Patrie homeowner to regain optimal comfort and complete energy efficiency . Our commitment: to offer professional, fast and sustainable HVAC service throughout Greater Montreal — Montreal, Laval, Longueuil, North Shore and South Shore .