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Réparation d’une thermopompe murale Fujitsu à Rosemont–La Petite-Patrie
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Repair of a Fujitsu wall-mounted heat pump in Rosemont–La Petite-Patrie

A Fujitsu heat pump recommissioned with rigor and precision

At AirGreen , we operate daily throughout Montreal , Laval , the North Shore and the South Shore to repair faulty HVAC systems . This intervention, carried out in the Rosemont–La Petite-Patrie district, concerned a Fujitsu wall-mounted heat pump that was no longer starting in heating mode.

The customer's call and the first symptoms

The owner contacted us after noticing that his normally reliable and quiet heat pump was no longer responding to the remote control. The indoor unit remained completely inactive, while the Fujitsu outdoor condenser , mounted on a wall bracket above a window, would no longer turn on.

The customer had already tried to reset the circuit breaker , without success. This was a typical sign of a faulty electronic board or a control circuit blocked by a power surge.

Complete on-site diagnosis

Our AirGreen technician, certified in Fujitsu systems, carried out a four-step diagnosis :

  1. Power supply check : stable voltage at 240 V. No fault on the power supply side.

  2. Inspection of communication wiring between indoor and outdoor units: continuity confirmed, no breaks or visible corrosion.

  3. External control board analysis : The error light was flashing in a 3-1 sequence, indicating a compressor temperature sensor fault.

  4. Compressor and start relay check : resistance correct, but relay inoperative - a problem often seen on Fujitsu units over 7 years old.

Intervention and repair

After obtaining the customer's agreement, we undertook a targeted repair :

  • Replacement of the defective starter relay with an original Fujitsu part.

  • Complete cleaning of the electronics box using a dielectric product to remove moisture deposits.

  • Checking the temperature sensor and tightening the internal connectors.

  • Complete heating and cooling cycle test.

During testing, the system restarted normally, achieving a stable hot airflow of 35°C at the indoor outlet after only five minutes of operation.

A concrete result and a reassured customer

Thanks to this rapid intervention, the customer's Fujitsu heat pump now operates smoothly, without excessive noise or vibration. The accurate diagnosis and immediate availability of our genuine parts prevented a costly main board replacement.

The client expressed his satisfaction with AirGreen's responsiveness and the quality of the work carried out without interruption of the wall or complete dismantling . We also took the time to optimize the positioning of the power cable to protect it from bad weather and infiltration.

Preventive maintenance recommendations

Our technicians remind us that even the best brands, like Fujitsu , require regular maintenance to maintain performance and avoid this type of breakdown. Here are the recommendations we have provided:

  • Clean the internal filters once a month.

  • Keep the space around the outdoor condenser clear (minimum 30 cm).

  • Perform an annual professional cleaning including checking pressures and energy efficiency.

  • Protect the outdoor unit from snow and ice using a ventilated shelter or lightweight awning.

Mistakes to avoid

It is common for homeowners to attempt to restart a wall-mounted heat pump by manipulating the circuit breakers or adding refrigerant without a complete diagnosis.
These actions can worsen the breakdown. The best approach is to call a certified HVAC professional like AirGreen, who is equipped to measure, test, and repair without damaging the equipment.

AirGreen expertise in Rosemont–La Petite-Patrie

This intervention perfectly illustrates our approach:

  • A thorough diagnosis before any repair.

  • Guaranteed original parts.

  • Courteous and lasting service.

Whether it is for an electronic card problem , a compressor breakdown or a lack of energy efficiency , our technicians intervene quickly in all boroughs of Montreal , as well as in Laval , on the North Shore and the South Shore .

Conclusion

At AirGreen , every service call is treated with the same rigor. Our goal is simple: to ensure the comfort and peace of mind of our customers through durable, precise, and safe repairs.
This Fujitsu wall-mounted heat pump in Rosemont–La Petite-Patrie is a perfect example: a refurbished system, a satisfied customer and restored comfort.