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Réparation d’un climatiseur mural Gree à Sainte-Julie
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Repair of a Gree wall-mounted air conditioner in Sainte-Julie

When a Gree wall-mounted air conditioner stops cooling in the middle of a hot day in Sainte-Julie

At AirGreen , we regularly receive service calls during periods of intense heat, especially when wall-mounted air conditioners are put under strain. This is exactly what happened to a customer in Sainte-Julie , on the South Shore of Montreal , whose Gree wall-mounted air conditioner had suddenly stopped supplying cold air.

The unit, installed above an interior door on the ground floor, showed clear signs of airflow blockage : the vanes remained open, but no air was being blown. In addition, a slight vibrating noise was emanating from the top panel.

Diagnosis: An electronic card problem and deferred maintenance

Upon arrival, we performed a complete diagnostic of the Gree 12,000 BTU wall-mounted system , powered by R-32 refrigerant . After removing the faceplate and inspecting the components, we found:

  • significant fouling of the evaporator coil (accumulated dust and grease);

  • a partially blocked drain , which caused slight seepage;

  • and most importantly, a faulty interior control board , unable to activate the fan motor.

This type of breakdown is common when annual maintenance is not carried out: dust and humidity create short circuits on sensitive electronic components.

Intervention: complete repair and refurbishment of the system

We first carefully disassembled the front panel to access the electronic board . This was tested using our professional multimeter, confirming the failure of the main relay. We then:

  1. Replaced the original Gree electronic card , supplied by our AirGreen warehouse in Laval.

  2. Deep cleaned the coil and tangential fan with a specialized biodegradable product.

  3. Unblocked and flushed the drain line with compressed air.

  4. Checked the operating current and pressure of the refrigeration circuit to ensure that no R-32 leaks were present.

Once the repair was complete, the air conditioner was restarted: the airflow was optimal, and the temperature dropped from 27°C to 22°C in less than 20 minutes.

Result: comfort restored and preventive maintenance recommended

Our client from Sainte-Julie found immediate comfort . We took advantage of the intervention to recommend annual preventive maintenance , particularly before the summer season, in order to:

  • extend the life of your Gree wall-mounted air conditioner;

  • avoid costly electronic card failures;

  • maintain optimal energy consumption.

At AirGreen , we emphasize the importance of these regular maintenances — especially for wall-mounted units operating with R-32 , which is more sensitive to humidity and micro-leaks.

AirGreen expertise: fast, transparent and local service

Thanks to our team of certified technicians , we respond quickly everywhere in Sainte-Julie , Longueuil , Brossard and throughout the South Shore . Each repair is documented, photographed and verified before the system is handed over to the customer.

We want every service call to end with a high-performance, quiet unit , and most importantly, a customer who is reassured about the reliability of their HVAC system.

AirGreen – HVAC specialists in Montreal, Laval, Longueuil, North Shore and South Shore.
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