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Réparation d’une thermopompe murale Tosot à Côte-des-Neiges
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Repair of a Tosot wall-mounted heat pump in Côte-des-Neiges

When the snow arrives: a typical Montreal service call

Winter is in full swing in Montreal , and on a snowy rooftop in Côte-des-Neiges , our AirGreen team intervened for a Tosot wall-mounted heat pump repair . Despite the winter conditions, this outdoor unit was an essential element for the comfort of a multi-unit residential building, providing both heating and cooling for the apartments.

Diagnosis: a heat pump in distress in the middle of winter

When we arrived, the Tosot heat pump was completely immobilized. The fan was no longer rotating and the unit was displaying an error code related to a faulty electronic board . Our technicians, accustomed to the region's extreme conditions, immediately carried out a thorough inspection.

The main findings:

  • Ice buildup on the base of the condenser, hindering natural drainage.

  • Electrical box exposed to frost , causing internal condensation.

  • Damaged control board , probably due to a short circuit due to humidity.

AirGreen intervention: precision and safety

Working on a snow-covered roof requires careful planning. Our technicians secured the area, cleared the immediate area of ​​snow, and then disconnected the power before any work was done.

The steps of the repair:

  1. Complete defrosting of the unit using forced hot air.

  2. Replacement of the Tosot control board with an original part.

  3. Checking electrical connections and grounding.

  4. Automatic defrost test to ensure proper operation of temperature sensors.

  5. Gradual restart of the system to stabilize the refrigerant pressure.

Result: comfort restored despite the snow

After restarting, the heat pump resumed normal operation. The customer was able to immediately notice the difference:

  • Heating restored in all units of the building.

  • Reduced noise level , thanks to fan balancing.

  • Optimized energy performance , confirmed by our pressure and intensity measurements.

We have also added a winter maintenance tip for the owner:

  • Always clear snow around the outdoor unit .

  • Check that the drains are not blocked .

  • Avoid using chemical deicers that can damage the fins.

Why choose AirGreen for your Tosot repairs in Montreal

At AirGreen , we are experts in the specific features of Tosot heat pumps , a brand renowned for its reliability, but sensitive to Quebec's climatic variations. Our certified technicians know how to adapt each intervention according to the installation constraints - whether it's a flat roof in Côte-des-Neiges , a terrace in Rosemont or a balcony in Laval .

We offer:

  • Fast service available 7 days a week during the cold season.

  • Guaranteed original parts .

  • Accurate diagnosis with calibrated measuring equipment.

  • Complete performance report after each intervention.

Lessons from this intervention

This case illustrates a common problem in Montreal: flat roof installations . While effective at maximizing space, they are prone to snow accumulation and thermal fluctuations. A properly elevated installation, with sufficient clearance, can prevent this type of failure.

Our recommendations:

  • Use insulated metal roof supports to reduce corrosion.

  • Provide a heating cable in the drain to prevent ice.

  • Perform an annual preventive inspection before winter.

Thanks to our rigorous approach, this client's Tosot heat pump has returned to optimal efficiency, ready to face the long cold weeks ahead.

At AirGreen , every service call is an opportunity to demonstrate our expertise, attention to detail and commitment to the lasting comfort of our customers in Montreal, Laval, Longueuil, the North Shore and the South Shore .