When winter comes to the condenser: an AirGreen intervention in Laval
At AirGreen , we are regularly called upon to intervene when HVAC systems are put to the test by Quebec winters. This is exactly what happened recently in Sainte-Dorothée, Laval , where a customer contacted us after noticing that their Gree wall-mounted heat pump seemed less efficient and covered in frost.
An accurate diagnosis for a frozen heat pump
Upon arrival, our technicians discovered that the outdoor unit—a Gree Inverter model running on R-32 refrigerant —was partially blocked by ice. This phenomenon, while common during periods of extreme cold, could indicate several possible causes:
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A faulty defrost sequence ;
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An incorrectly calibrated temperature sensor ;
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Or a drainage problem preventing the frost from melting.
To confirm the source of the problem, we performed a complete check of the defrost cycle , coil sensor and electronic board control . Refrigerant pressures were also measured to ensure there were no leaks.
Intervention: complete restoration of service
After our tests, the diagnosis was confirmed: the defrost sensor was defective . This small, yet essential, part prevented the system from correctly detecting the outside temperature and triggering automatic defrosting.
Our technicians have:
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Replaced the defective sensor with an original Gree part;
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Cleaned the evaporator and condenser to optimize airflow;
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Checked the proper flow of condensates and the operation of the fan;
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Tested the complete system to confirm proper activation of the defrost cycle.
Result: performance and comfort restored
Once the repair was completed, the Gree heat pump resumed optimal operation. The air temperatures measured at the outlet of the indoor unit confirmed stable thermal performance , even at -15°C outside. The customer immediately noticed a return to consistent comfort in his home, without abnormal noise or cycles.
At AirGreen, we emphasize the importance of regular maintenance , especially for wall-mounted inverter systems that operate with modern refrigerants like R-32 . These units are highly efficient, but sensitive to the accuracy of their sensors and the proper maintenance of their components.
AirGreen Expert Tips to Prevent Frost on Your Heat Pump
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Clean the internal filters every two months.
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Make sure nothing is obstructing the outdoor condenser (snow, leaves, debris).
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Have annual preventative maintenance performed by a certified technician.
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In case of abnormal noise or loss of performance, turn off the device and contact us immediately .
AirGreen expertise in Laval and throughout Quebec
This intervention in Sainte-Dorothée illustrates our approach: a rigorous diagnosis , a lasting repair , and total transparency with our customers. Each repair is an opportunity to extend the life of the system and improve the energy efficiency of the home.
Our teams operate daily in Montreal, Laval, Longueuil, on the North Shore and the South Shore to repair heat pumps from Gree, Sharp, Midea, Fujitsu, Hitachi , and many other brands. We always strive to maintain the highest standards of service, with a constant attention to detail and compliance with CSA and BNQ standards.
Are you noticing frost or a drop in performance on your heat pump?
Contact AirGreen , your trusted partner for all HVAC repair services in Laval and Greater Montreal. Our certified technicians will get your system back in tip-top shape, quickly and efficiently.