An urgent service call for a loss of heat
At AirGreen , we were recently contacted by a homeowner in Boisbriand , on the North Shore of Montreal , regarding a problem with a Fujitsu wall-mounted heat pump that was no longer producing heat in the middle of the mid-season. The customer had noticed that the unit was operating in ventilation mode only, without reaching the requested temperature, despite several attempts to restart it.
Upon arrival, we noticed that the system—a 12,000 BTU Fujitsu Halcyon model—was installed in an open, mezzanine-style area, typical of cathedral-roofed homes. This type of layout emphasizes the importance of proper compressor operation and automatic defrosting, two points we immediately checked.
Complete inspection and precise diagnosis
Our certified technician began with a series of methodical tests:
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Compressor inrush current measurement : no start observed.
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Electronic card control : control signal sent correctly to the outside.
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Checking the communication wiring between indoor and outdoor units: continuity confirmed.
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Refrigeration pressure analysis : total absence of pressure — sign of a refrigerant leak .
After inspecting the outdoor coil, a trace of oil was detected at a loose flare connection . This slow leak, probably present for several months, had emptied the refrigeration circuit.
On-site repair: detection, tightening and complete recharge
The repair was carried out in three stages:
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Cleaning and tightening of the defective connection , with replacement of the copper seal to ensure watertightness.
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Nitrogen leak test at 350 psi for 30 minutes - result: no loss.
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Complete recharge of the system with R410A , according to Fujitsu specifications (exact quantity adjusted to the gram).
Once the pressure and vacuum were confirmed, the system was put back into service. The compressor started normally, and within minutes, the discharge temperature reached 47°C , indicating optimal thermal efficiency.
Results and recommendations
After the repair, our team took the time to explain to the customer some best practices to prevent future leaks:
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Avoid moving or bumping the copper lines behind the wall unit.
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Schedule a complete annual maintenance , including pressure check, coil cleaning and inspection of connections.
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Watch for any drop in performance or unusual hissing noises—often the first signs of a leak.
This case in Boisbriand perfectly illustrates the importance of calling on a team specialized in Fujitsu systems . Our AirGreen technicians have the equipment and knowledge to work on all models of the brand, whether it is a simple loss of performance or a major component replacement.
AirGreen expertise: precision, reliability and personalized service
At AirGreen, every repair is an opportunity to restore your HVAC system to its original performance, while ensuring its durability. Our interventions are documented, guaranteed and carried out according to RBQ and CCQ standards.
Our service covers all of Greater Montreal , including Laval, the North Shore and the South Shore , and each call is treated with the same rigor:
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Fast and transparent diagnosis ;
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Original or certified equivalent parts ;
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Complete post-repair check ;
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Personalized maintenance advice .
Thanks to this approach, the Boisbriand client now enjoys restored comfort, a stable energy bill and a Fujitsu heat pump ready to face the winter.