Loss of performance reported by attentive owner
A customer from Sainte-Dorothée , Laval , recently contacted us after noticing that their Gree wall-mounted heat pump was no longer producing sufficiently cool air. Installed on the back wall of a brick house, this unit, although renowned for its reliability, was showing clear signs of loss of efficiency. At AirGreen , we know that such a symptom can hide several possible causes: refrigerant leak, airflow obstruction, or faulty electronic component.
Our mission: to diagnose accurately , repair efficiently and restore the system to full performance, without compromising on durability.
Complete on-site diagnosis
Upon our arrival, our technician carried out a series of systematic inspections.
1. Visual check
The Gree Inverter outdoor unit appeared to be in good overall condition. However, the refrigerant pipe insulation showed signs of premature wear: some sections of foam had disintegrated, partially exposing the copper pipes. This can cause the fluid to overheat and impair the system's cooling capacity.
2. Temperature and pressure measurements
Using an infrared thermometer and a digital manifold, we measured:
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A blown air temperature of 13.4°C , too high for a normal air conditioning cycle;
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Low pressure slightly below manufacturer's specifications .
These clues clearly guided the diagnosis: a micro-leak of refrigerant was probable.
3. Leak test
We then injected a tracer gas and used an electronic leak detector . After a few minutes, the leak was located at the upper flare connection , a junction point exposed to thermal variations.
Repair: precision and rigor
Our interventions always adhere to the strictest technical standards. Here are the steps we take:
Disassembly and preparation
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Disconnect the system and safely purge.
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Thoroughly clean the fitting to remove all traces of oil.
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Cutting the copper pipe to obtain a perfectly smooth surface before reflaring.
Flare replacement and tightening
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New flare formed using a calibrated flare .
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Application of high pressure sealing paste .
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Controlled tightening to the torque recommended by Gree to avoid any mechanical stress.
Vacuum repacking and refilling
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Vacuum the circuit for 45 minutes.
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Exact refill of R-32 refrigerant, weighed to the nearest gram according to the device's nameplate.
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Final test: after 15 minutes of operation, the blowing temperature dropped to 6.2°C , confirming optimal performance .
Finishing and protection of pipes
To prevent the problem from recurring, we have:
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Replaced pipe insulation with UV-resistant closed-cell foam;
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Properly fixed the ducts to the wall with new fasteners;
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Checked the slope of the condensate drain to ensure good flow.
These details, often overlooked, make all the difference in the lifespan of the HVAC system .
Result: restored efficiency and reduced consumption
The customer immediately noticed the change: the air circulated was fresher, the operating cycle quieter and the interior temperature much more stable.
Thanks to the repair and re-insulation, the Gree heat pump will operate more efficiently, reducing energy consumption by 10% to 15% during the summer.
What this service call illustrates
This intervention in Sainte-Dorothée demonstrates the importance of preventive maintenance of Gree systems and all wall-mounted heat pumps:
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Progressive microleaks can go unnoticed for months.
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Deteriorated insulation affects overall performance.
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And a quick diagnosis can help avoid more expensive major repairs.
At AirGreen , we always favor a preventive and sustainable approach, combining technical expertise, transparency and compliance with safety standards. Our certified technicians operate throughout Greater Montreal , from Laval to Longueuil , including the North Shore and the South Shore , to guarantee the comfort and reliability of each system.
AirGreen Tips to Extend the Life of a Gree Wall-Mounted Heat Pump
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Clean filters every 4 to 6 weeks during the active season.
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Visually check the condition of the pipe insulation every spring.
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Schedule an annual professional maintenance , including checking pressures and performance.
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Avoid the accumulation of vegetation around the condenser to preserve air circulation.
These simple actions guarantee optimal comfort and a longer lifespan for your heat pump.
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