Repair of a Tosot wall-mounted air conditioner in Brossard

A service call in the heat of summer

In the middle of this particularly hot July in Brossard , our AirGreen team received an emergency call from a customer whose Tosot wall-mounted air conditioner was no longer blowing cold air. Installed in a modern condo in the DIX30 district, the three-year-old unit was displaying an ambient air temperature barely lower than that of the room, despite the "cool" mode being activated at full power.

At AirGreen , we know how quickly a wall-mounted air conditioning unit breakdown can make the atmosphere uncomfortable, especially during Quebec's heat waves. Our technician therefore went on site the same day to carry out a complete diagnosis .

Accurate diagnosis using an infrared thermometer

Upon arrival, our specialist checked the airflow coming out of the indoor unit using an infrared thermometer. The reading indicated 12.9°C , an abnormally high value for a unit operating in air conditioning mode. This reading confirmed a drop in the performance of the refrigeration system .

Our diagnostic steps were structured as follows:

1. Air filter inspection : it was clean, eliminating the possibility of restricted airflow.

2. Check the fan and blower motor : normal operation, without obstruction or abnormal noise.

3. Refrigerant pressure check : The measured values ​​revealed a partial lack of R-410A gas , indicating a slight but progressive leak.

Locating and repairing the leak

After connecting the manifold and performing a nitrogen pressure test, our technician detected a micro-leak at the flare connection of the indoor coil . This type of leak, common after a few repeated thermal cycles, can gradually reduce the cooling capacity without causing the unit to completely shut down.

The repair consisted of:

• tighten the fitting after complete cleaning;

• apply a specialized sealant ;

• perform an extended 45-minute leak test ;

• recharge the system with R-410A refrigerant according to the exact specifications of the Tosot manufacturer.

Recommissioning and final check

Once the recharge was complete, the unit was restarted. A few minutes later, the blowing temperature displayed 6.1°C , confirming the return to optimal performance. The display on the wall unit indicated a target temperature reached, and the customer immediately felt the difference: fresh, constant and quiet air .

Why use AirGreen for your HVAC repairs?

Every wall-mounted air conditioner repair requires precise know-how and suitable tools. At AirGreen , we favor a rigorous diagnostic approach, combined with:

• certified and trained technicians on all brands (Tosot, Gree, Midea, Fujitsu, Sharp, etc.);

• professional measuring equipment ;

• original parts and methods that comply with CSA and RBQ standards;

• rapid intervention throughout Greater Montreal, including Laval, Longueuil, the North Shore and the South Shore .

Maintenance tips to prevent this type of breakdown

To maximize the life of your wall-mounted air conditioner:

• Clean the air filters every month during the summer season;

• Avoid setting the temperature too low (ideal range: 22 – 24°C);

• Have the refrigerant level checked every two years;

• Ensure annual preventative maintenance by an AirGreen professional to avoid micro-leaks and ensure consistent energy efficiency.

A restored performance and a satisfied customer

Thanks to a methodical and rapid intervention, the customer's Tosot wall-mounted air conditioner in Brossard regained its full cooling capacity. The owner, impressed by the accuracy of the diagnosis and the transparency of the process, opted for our AirGreen+ maintenance program , which ensures a complete and priority annual inspection in the event of a breakdown.

At AirGreen , every service call is handled with the same attention to detail: accurately diagnosing, sustainably repairing, and restoring comfort and peace of mind to our customers .