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Réparation d’un climatiseur mural Fujitsu à Boisbriand
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Fujitsu wall-mounted air conditioner repair in Boisbriand

An old wall unit that refuses to start: a classic of early summer

At AirGreen , we were recently called to intervene in a single-family residence in Boisbriand , on the North Shore of Montreal . The owner, a loyal customer, contacted us in the first warm days of spring: his Fujitsu wall-mounted air conditioner , installed for more than 15 years, was no longer turning on despite several attempts with the remote control.

The unit, mounted on the wall of a natural stone staircase, looked solid, but the signs of wear were evident: yellowed plastic, stiff fins, and inactive indicator lights. Our mission: to diagnose and restore the unit to service without having to replace it .

Diagnosis: A power supply and control board problem

Our certified technicians carried out a methodical inspection of the device:

  1. Power supply check : the circuit breaker had not tripped, but the voltage measured at the input terminal was unstable.

  2. Internal fuse inspection : slightly blackened — first sign of a minor short circuit .

  3. Analysis of the electronic board : visible oxidation on the tracks, caused by ambient humidity in the basement and time.

  4. Low voltage transformer test : output voltage lower than 12 V instead of the required 24 V.

The verdict: A faulty control board and a worn transformer were preventing the unit from starting properly. Both needed to be replaced to bring the unit back to life.

Intervention: electronic repair and upgrade

Rather than recommending a complete replacement, our team opted for a sustainable and cost-effective approach. Here are the steps we took:

  • Replacement of internal fuse and transformer with equivalent genuine Fujitsu parts.

  • Deep cleaning of the printed circuit board using a specialized solvent to remove traces of oxidation.

  • New solder on the weakened tracks of the control board.

  • Complete test of the compressor and fan motor to ensure continuity of power.

  • System reboot and automatic mode calibration (cold/heat).

Upon restart, the unit came back to life: the lights came on, the fan started smoothly, and cold air was quickly felt in the stairwell.

Result: comfort restored and device saved

After our interventions:

  • The Fujitsu wall-mounted air conditioner was operating at full capacity without excessive noise or vibration.

  • The blown air temperature reached 10°C – proof of good cooling efficiency.

  • The customer was able to avoid a costly replacement , extending the life of his unit by several years.

  • We have also installed a new antibacterial filter to optimize air quality.

This refurbishment has restored the thermal comfort of the home while reducing electricity consumption, thanks to the optimal operation of the compressor and the motor.

AirGreen Expertise: Maintain and restore rather than replace

Fujitsu air conditioners are renowned for their reliability, but like any HVAC system, they require regular maintenance and increased vigilance after a decade of service. At AirGreen , our philosophy is clear: before recommending a replacement, we always explore sustainable repair solutions .

Our technicians are trained to work on all popular brands in Montreal and on the North Shore:

  • Fujitsu , Gree , Sharp , Midea , Daikin , Trane , Goodman , Lennox , and many more.

  • Repair of capacitors , electronic cards , temperature sensors , ventilation motors , or condensate problems .

Prevention: How to extend the life of a wall-mounted air conditioner

To avoid similar breakdowns, we recommend our customers:

  • Have their system's electrical circuit checked every two years.

  • Clean the filters every month during the summer season.

  • Avoid obstructing the air flow (furniture, curtains, shelves).

  • Have the unit serviced by an AirGreen technician before each summer.

These simple actions can extend the life of a wall-mounted appliance by an additional 5 to 10 years.

An exemplary repair in Boisbriand

This Fujitsu wall-mounted air conditioner repair service in Boisbriand demonstrates the effectiveness of our approach: precise diagnosis, targeted intervention, and total customer satisfaction .

Thanks to our expertise, the customer now benefits from optimal comfort and a perfectly functional device, while having avoided the cost and work of a complete replacement.

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