A service call for an air conditioner that was no longer cooling
At AirGreen , we were recently called to intervene in Ville Mont-Royal , in a residence where a Gree wall-mounted air conditioner was no longer producing cold air, despite a correctly adjusted thermostat and an active indicator light. The customer had noticed that the machine was operating normally—the blades were moving, the indicator light was on—but the air blown remained lukewarm, even in air conditioning mode.
First inspection: condition of the indoor unit
Our technician began by opening the top cover of the wall-mounted air conditioner to access the filters and evaporator . The unit, installed near the central aisle, showed extremely dirty filters : a thin layer of dust and pollen had accumulated on the filter surface, drastically reducing airflow.
A quick visual diagnosis also revealed:
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A slightly frosted evaporator coil .
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Blocked heat exchange fins .
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A smell of stagnant humidity coming from the condensate tray.
These elements clearly indicated a lack of regular maintenance , a common cause of performance losses on Gree wall systems.
Checking the refrigeration circuit
After cleaning the filters for a functional inspection, we measured the refrigerant pressures on the circuit. Result: the gas level was slightly below the standard , suggesting a microleak, probably at a flare connection on the outdoor unit.
We then have:
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Injected a fluorescent tracer into the circuit to detect the leak.
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Confirmed the presence of a micro-leak at the compressor connection .
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Completed a complete seal repair and R410A refrigerant recharge according to Gree manufacturer's specifications.
Thorough cleaning and maintenance
Before returning to service, a complete cleaning of the internal system was carried out:
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Antibacterial cleaning of the evaporator coil using a no-rinse disinfectant product.
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Vacuuming and steam washing of the condensate tray and drain.
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Replacing the insulating tape on the liquid line.
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Final disinfection of the facade and air diffusion grilles.
Final results and tests
After these steps, the Gree wall-mounted air conditioner regained its full cooling capacity . During performance tests:
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The air blown out was 10°C cooler than the ambient air .
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The noise level has decreased thanks to the cleaning of the turbine.
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The condensate drainage was carried out perfectly, without leaks or stagnant water.
The customer immediately noticed an improvement in comfort and a reduction in room cooling time .
Preventive maintenance advice given to the customer
We took the time to explain to the customer the best maintenance practices to extend the life of his Gree wall-mounted air conditioner:
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Clean filters every 4 to 6 weeks during the warm season.
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Schedule an annual professional service to check refrigerant pressure.
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Avoid leaving the temperature set too low for long periods, which can promote frost formation .
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Ensure the drainage line remains clean and clear.
AirGreen expertise serving Town of Mount Royal
This type of intervention perfectly illustrates the AirGreen philosophy: intervene quickly, diagnose accurately, and bring HVAC systems back to life . We work daily on major brands such as Gree, Midea, Fujitsu, Mitsubishi, Zephyr and LG , throughout the Greater Montreal area, including Montreal, Laval, Longueuil, the North Shore and the South Shore .
Our certified technicians ensure that every system, regardless of age or brand, returns to optimal energy efficiency and extended lifespan .
Comfort restored, efficiency guaranteed
Thanks to our intervention, the Gree wall-mounted air conditioner in Ville Mont-Royal is once again operating with maximum cooling performance and exemplary operating silence . Concrete proof that rigorous maintenance and technical expertise make all the difference in the longevity of an HVAC system.