A fast and efficient service call from AirGreen
In the quiet town of Sainte-Julie , on Montreal's South Shore , a homeowner contacted us after noticing that her Fujitsu wall-mounted heat pump wouldn't start, despite repeated attempts. In the middle of the mid-season, this type of situation can quickly become uncomfortable: cool nights, warmer days, and an inactive HVAC system mean a temperature imbalance that's difficult to manage.
At AirGreen , our priority is to restore comfort to Quebec homes as quickly as possible . We therefore dispatched an experienced technician to Sainte-Julie to diagnose and repair the heat pump.
Fault diagnosis: a discreet electrical problem
Upon arrival, our technician performed a complete visual inspection of the Fujitsu outdoor compressor , which was mounted on a beige vinyl wall and securely mounted on galvanized wall brackets. The installation was clean and recent, but the unit did not respond to any control signals.
Using a multimeter, we found that the power supply was interrupted at the control relay . An irregular voltage was coming from the external connection box. Upon verification, the problem was caused by a loose connection in the circuit breaker installed near the window. This type of failure, although minor, can completely immobilize a wall-mounted heat pump.
In parallel, we checked:
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The connection terminals between the indoor and outdoor unit.
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The communication wiring to detect any traces of oxidation.
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The pressure of R-410A refrigerant , confirmed in Fujitsu standards.
System repair and optimization
After identifying the cause, our team:
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Replaced the defective circuit breaker with an approved and better insulated model for Quebec winter conditions.
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Cleaned the electrical connections and applied dielectric protection to prevent future oxidation.
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Checked compressor and fan operation to ensure restart without overload.
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Performed a full test in air conditioning and heating mode , confirming a stable temperature rise and minimal noise level.
Thanks to these interventions, the Fujitsu heat pump was back to full efficiency. The customer was delighted to see that the heat returned instantly inside, and that her system was once again responding quickly to the remote control.
Essential preventive maintenance
This intervention clearly illustrates the importance of annual maintenance of HVAC systems , even for well-known brands like Fujitsu. A preventive check helps avoid:
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Unexpected electrical failures , often due to minor parts.
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Accumulation of dust or moisture in exterior enclosures.
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Overconsumption of energy due to loose connections or incorrect refrigerant pressures.
At AirGreen, we always recommend our customers schedule a complete maintenance before each winter . This ensures optimal performance and extends the life of the heat pump.
An aesthetic and professional finish
During this repair, we also took care to readjust the beige trunking that protects the refrigeration lines. This attention to detail, often overlooked, not only contributes to the visual cleanliness of the installation , but also to the protection of the ducts against bad weather and UV rays.
Our technicians ensure that every intervention—whether it's a repair or maintenance—leaves the site as clean and orderly as when we arrived.
AirGreen: your HVAC reference on the South Shore
From Sainte-Julie to Brossard , via Longueuil, La Prairie and Saint-Bruno , AirGreen puts its expertise at the service of homes and businesses on the South Shore of Montreal . Our technicians specialize in the repair of Fujitsu, Gree, Midea, Sharp and other well-known brand wall-mounted heat pumps and guarantee fast, precise and long-lasting interventions.
Every service call is handled with the same level of commitment: thorough diagnosis, total transparency and customer satisfaction above all .
In conclusion , this repair in Sainte-Julie once again demonstrates AirGreen's thoroughness and professionalism. Thanks to a quick diagnosis and targeted intervention, our client's Fujitsu wall-mounted heat pump is now working like new—quiet, efficient, and ready to handle Quebec's temperature fluctuations.