A service call for a Gree air conditioner that was no longer cooling
On a swelteringly hot day in Saint-Constant , on Montreal's South Shore , a homeowner contacted us about a Gree wall-mounted air conditioner that appeared to be working, but the air blown remained lukewarm. The unit, installed in the main living room, displayed all the normal operating lights, but the interior temperature would not drop, even after several hours.
At AirGreen , this type of symptom is typical of a partial refrigeration circuit failure or a sensor issue . Our technicians arrived on site the same day to perform a complete HVAC system inspection , determined to quickly restore home comfort.
Diagnosis: Lack of refrigerant and a temperature sensor at fault
Upon arrival, we visually inspected the Gree indoor unit, a sleek, compact wall-mounted model. There were no signs of water leaks or excessive condensation. However, the outdoor compressor pressure—measured using our digital pressure gauge—indicated abnormally low pressure .
At the same time, our technicians noticed that the evaporator temperature sensor (thermistor) was transmitting inconsistent values to the electronic board. This error prevented the compressor from properly regulating the cooling power.
Probable causes identified:
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Micro-leak of R-410A refrigerant in the suction circuit;
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Faulty thermistor causing erroneous signal;
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Accumulation of dust reducing air circulation on the exchanger.
System repair and upgrade
Our team began the complete repair in three stages:
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The leak was investigated and sealed using an electronic detector and a pressurized nitrogen test. A minimal leak was located at the flare connection between the indoor unit and the copper pipe.
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Replacement of the temperature sensor (thermistor) with an original Gree part, compatible with the series concerned.
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Complete circuit recharge with R-410A refrigerant , calibrated according to the device specifications.
Before restarting, we cleaned the air filters and disinfected the evaporator with a no-rinse antibacterial product to optimize airflow and interior quality.
Results: restored comfort and renewed efficiency
Upon restart, the Gree wall-mounted air conditioner resumed normal operation. The measured outlet temperature was 10.8°C , indicating perfect cooling performance. The customer immediately noticed the difference: silence, stability, and consistent coolness throughout the living room.
We also took the time to explain good maintenance practices to our client:
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Clean filters every 4 to 6 weeks;
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Avoid blocking airflow with furniture;
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Schedule annual preventative maintenance with inspection of refrigerant and electrical connections.
Why trust AirGreen for your Gree repairs
As HVAC experts in the greater Montreal area, we work daily on Gree systems , renowned for their reliability but requiring rigorous maintenance to maintain their energy efficiency.
Our certified technicians are trained to diagnose and repair any type of breakdown:
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Losses of R-410A or R-32 refrigerant;
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Damaged electronic cards;
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Communication problems between indoor and outdoor units;
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Sensor and fan malfunctions.
We serve all of Greater Montreal, Laval, Longueuil, the North Shore and the South Shore , with fast, professional and guaranteed service.
In conclusion
This Gree wall-mounted air conditioner repair in Saint-Constant perfectly illustrates our approach: a methodical diagnosis, a precise intervention, and a lasting result. At AirGreen , our priority is to offer you optimal comfort and maximum energy performance , season after season.