A service call after cooling problems
At AirGreen , we often receive calls in the middle of summer about wall-mounted air conditioners that stop cooling effectively. This is exactly the case for this customer in Sainte-Julie , on the South Shore of Montreal , whose Gree wall-mounted air conditioner was no longer blowing cold air despite a normal display on the remote control. The unit, installed in a newly renovated living room, seemed to be working, but the ambient temperature remained uncomfortable.
Accurate diagnosis: refrigerant leak and frosted sensor
Upon our arrival, our technicians performed a complete inspection of the refrigeration circuit and temperature sensors. Several clues quickly pointed us in the right direction:
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No temperature difference between the air inlet and outlet of the wall unit.
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Excessive condensation on the indoor coil, a sign of an imbalance in the circuit.
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Abnormally low refrigerant pressure on gauge reading.
The verdict: a micro-leak of refrigerant on the suction line, combined with a frosted sensor that prevented the system from correctly detecting the temperature.
Repair and upgrade steps
Our specialists undertook a complete and methodical intervention :
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Leak detection and sealing :
Using a pressurized nitrogen test and an electronic detector, we located the microleak on a copper circuit connection. The area was precisely soldered and then retested to ensure a leak-tight seal. -
Replacing the interior temperature sensor :
We installed an original Gree sensor , calibrated to the manufacturer's specifications, ensuring precise control of the cooling cycle. -
Complete recharge of R410A refrigerant :
After vacuuming and stabilizing the system, we recharged the circuit according to the exact weight prescribed by the manufacturer. -
Final performance test :
After restart, the blowing temperature dropped to 9°C , confirming optimal performance and restored energy efficiency .
Result: comfort restored and efficiency guaranteed
At the end of the intervention, the customer immediately noticed a noticeable difference in comfort . The air supply was powerful, stable, and quiet. We checked the power consumption and defrost cycle to ensure everything was operating within ideal parameters.
In addition, we took the time to explain some good maintenance practices to the customer:
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Clean the filters every 3 to 4 weeks during the summer.
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Keep the outdoor unit clear of any obstructions.
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Schedule annual preventative maintenance with AirGreen before each warm season.
AirGreen Expertise: Precision, Cleanliness and Reliability
Our interventions are distinguished by our technical rigor and attention to detail. Each repair is documented, with measurements, photos and recommendations to support it. Whether it is for a gas leak, an electronic card failure or a loss of performance , our teams cover all of Greater Montreal, Laval, Longueuil, the North Shore and the South Shore .
Your Gree, Fujitsu, Midea or Zephyr wall-mounted air conditioner deserves professional maintenance — and AirGreen is here to provide you with fast, accurate and long-lasting service .