Accurate diagnosis and rapid intervention on a high-rise residential unit
At AirGreen , we are regularly called for service calls on Gree wall-mounted heat pumps throughout the Laval region. This intervention, carried out in Sainte-Dorothée , perfectly illustrates our methodical and careful approach when it comes to diagnosing and correcting performance problems on a unit installed high up on a residential terrace.
Context of the service call
The customer contacted us after noticing that their Gree wall-mounted heat pump was no longer producing sufficient heat despite continuous operation. The unit, installed on a wall bracket at deck level, appeared to be operating mechanically, but the indoor temperature remained unchanged.
Upon our arrival, our technicians conducted a thorough inspection of the outdoor compressor . The setup showed a recent Gree system, with an R410A inverter compressor , securely mounted on a raised metal base near a patio door. The environment, although protected, slightly exposed the unit to side winds—an important detail for heating efficiency.
Technical diagnosis: abnormal pressures and partial pressure loss
Our measuring tools revealed lower than normal suction pressure , indicating a partial refrigerant leak . The symptoms were consistent with the customer's testimony: the heat pump was working, but the thermal efficiency was significantly reduced.
The stages of diagnosis:
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Checking the refrigerant connections : a slight oil seepage detected on a Schrader valve.
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Nitrogen pressure test : slow loss confirming a microleak.
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Refrigeration cycle analysis : irregular subcooling, confirming a lack of fluid.
Intervention: search for and correction of the leak
After identifying the source, our technicians:
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Tightened the leaky fittings and replaced the faulty valve cap.
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Performed a full vacuum with a double-stage pump.
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Recharge the system with R410A refrigerant according to Gree manufacturer's specifications.
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Final test under pressure gauges : balanced and stable pressures.
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Checking the supply temperature at the indoor unit — as expected, with a delta T of more than 15°C.
Result: restored comfort and optimal performance
Within minutes of restarting, the interior temperature rapidly increased, confirming a return to full performance . The customer noted quieter operation and smoother start-up, typical of a properly powered and balanced inverter compressor.
AirGreen Recommendations to Prevent Similar Problems
We recommended:
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A complete annual inspection of the HVAC system , including leak testing.
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Cleaning the coils before winter.
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Checking the metal support to ensure its stability (important on balconies and terraces exposed to vibrations).
These preventive measures extend the life of the heat pump and ensure optimal operation in all seasons .
Why choose AirGreen for your heat pump repairs in Laval
At AirGreen, we focus on:
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Accurate diagnostics based on real performance data.
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Fast and careful interventions , compliant with RBQ and CCQ standards.
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Multi-brand expertise (Gree, Midea, Sharp, Fujitsu, Bosch, and more).
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Attentive and transparent customer service , from the first call to the final restart.
Whether your system has a leak, abnormal noise or a lack of heat, our certified technicians respond quickly throughout Laval , as well as on the North Shore , the South Shore , and in Greater Montreal .
AirGreen – Air Conditioning & Heating: the benchmark in Gree heat pump repair in Laval and throughout Quebec.