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Réparation d’une thermopompe murale Fujitsu à Chomedey, Laval
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Fujitsu wall-mounted heat pump repair in Chomedey, Laval

Rapid intervention in the middle of winter: a service call from AirGreen

At AirGreen , we know how essential reliable heating is during Quebec's bitter cold. This service call in Chomedey, Laval , involved a Fujitsu wall-mounted heat pump installed on the facade of a modern residential building. The customer had noticed that their heat pump was no longer producing adequate heat despite normal sound operation—a typical symptom of a defrost or refrigerant pressure issue.

Accurate diagnosis despite the cold

Upon our arrival, our technician secured access to the outdoor unit, located high up. At -10°C, he carried out a complete diagnostic:

  • Defrost cycle check : the system was not properly switching to defrost mode, causing ice to build up on the heat exchanger.

  • Refrigerant check : pressures were slightly lower than normal, indicating a small leak.

  • Wiring and sensor inspection : The defrost sensor showed inconsistent values, confirming a malfunction.

Thanks to a quick analysis, the source of the problem was identified: a faulty defrost sensor combined with a micro-leak in the copper line.

Repair and recommissioning

Our team replaced the original Fujitsu defrost sensor , then proceeded to a complete refrigeration circuit reconnection after detecting and sealing the leak. A vacuum was performed, followed by a recharge with R-410A according to the manufacturer's specifications.

Before returning to service, we carried out:

  • a complete test of the heating cycle ;

  • an automatic defrost check ;

  • a control of discharge and suction temperatures .

Result: the heat pump returned to optimal operation, with a stable hot air flow and perfectly regulated automatic defrosting.

Expertise and safety above all

Working on high-rise wall-mounted heat pumps requires extensive experience and strict adherence to safety regulations. At AirGreen, we use secure ladders, approved harnesses , and a rigorous winter repair protocol. Our technicians are RBQ certified and trained according to CCQ standards to ensure reliability and complete compliance with every repair.

Recommended preventive maintenance

After the repair, we advised the customer to have a full annual service , including:

  • cleaning the outdoor unit and coil;

  • checking gas pressures and defrost cycle;

  • electrical inspection and calibration of sensors.

These steps ensure the long-term performance of any Fujitsu heat pump and prevent unexpected breakdowns during the cold season.

Comfort restored in Laval

Thanks to this rapid intervention, the customer has regained efficient heating and normal energy consumption . His Fujitsu heat pump is now operating at full capacity, ensuring warmth and comfort all winter long.

At AirGreen , we are proud to offer our customers in Laval, Montreal, Longueuil, the North Shore and the South Shore reliable, professional and durable HVAC repair services .