A typical service call in the heart of Laval
At AirGreen , we are often called upon to intervene for Midea heat pump breakdowns in the residential neighborhoods of Sainte-Rose , in Laval. This area, composed of single-family homes surrounded by greenery, requires reliable heating and air conditioning systems throughout the year.
Recently, a customer contacted us after noticing a lack of performance in heating mode on their Midea wall-mounted heat pump. The outdoor unit seemed to be freezing faster than normal, and the house was struggling to reach the set temperature.
On-site diagnosis: a frozen unit and a faulty exchanger
Upon our arrival, our technicians noticed a buildup of frost on the top of the condenser, as seen in the photo.
This type of problem frequently occurs when:
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The defrost cycle does not activate correctly;
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The outside temperature sensor is faulty;
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Or, when an imbalance in refrigerant pressure prevents the fluid from circulating efficiently.
Our specialists carried out a series of checks:
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Fan inspection : smooth rotation, no abnormal noise.
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Pressure control using R-32 gauges, the refrigerant used in this Midea model.
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Test the defrost sensor and the electrical wiring connecting the main board to the outdoor unit.
The result: a frozen, faulty sensor , causing a shift in the temperature reading. This component was preventing the unit from entering a defrost cycle, which explained the visible layer of ice.
Intervention: sensor replacement and drainage optimization
After confirming the diagnosis, we have:
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Replaced the defrost sensor with a genuine Midea part;
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Cleaned the external heat exchanger using a biodegradable product designed for aluminum fins;
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Checked the condensation drainage under the base of the unit, often neglected, to prevent ice from forming under the compressor.
We also adjusted the unit's level , tilting it slightly backward to promote natural water flow during defrost cycles. A simple correction board restored the optimal angle.
Final testing and performance improvement
Once the repairs were completed, our technicians restarted the heat pump in heating mode at 26°C . After 15 minutes of operation:
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The refrigerant pressure has stabilized at normal values;
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Automatic defrosting has been activated correctly;
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The air blown inside now reached 43°C , proof of restored efficiency.
We advised the customer to keep the outdoor unit clear of vegetation and to avoid the accumulation of leaves or moss on the support, as can be seen around its installation. These small details significantly extend the life of a Midea system.
Why use AirGreen for your Midea heat pump in Laval?
Our interventions in Sainte-Rose, Chomedey, Sainte-Dorothée and Vimont demonstrate how essential maintenance and preventive repair are.
At AirGreen , we:
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We only use original parts for the brands we represent (Midea, Gree, Fujitsu, Sharp, etc.);
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We offer fast and guaranteed service for emergency calls, everywhere in Laval, Montreal, Longueuil, on the North Shore and the South Shore ;
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And we provide full follow-up after each repair, including a pressure and energy efficiency check.
The satisfied owner has already entrusted us with the annual maintenance of his system. Thanks to this repair, his Midea heat pump now works like new, providing comfort and peace of mind for the Laval winters to come.
In summary
This Midea heat pump repair in Sainte-Rose perfectly illustrates our approach: rigorous diagnosis, certified parts, and attention to detail at every step.
A defrost failure may seem minor, but when neglected, it can damage the compressor or reduce the system's energy efficiency.
That's why, at AirGreen, we respond quickly—and always with the precision of a team specializing in residential HVAC systems in the greater Montreal area.