A revealing service call: Fujitsu heat pump performance loss
At AirGreen , our work in Montreal often takes us to residential neighborhoods where HVAC systems must cope with Quebec's demanding seasons. Our team was recently called to a charming brick home in Outremont , where a Fujitsu wall-mounted heat pump was no longer heating properly as fall approached.
The customer noticed a gradual drop in the blown air temperature, even when the unit was operating at full power. During a transition period, this symptom is typical of an unbalanced refrigeration circuit or a lack of preventive maintenance.
Initial inspection and in-depth diagnosis
Upon arrival, we noticed the outdoor unit—a Fujitsu Halcyon HFI condenser —partially covered in climbing vegetation . This detail, often seemingly innocuous, can actually seriously impair compressor ventilation and heat exchange. An obstruction to airflow leads to overheating and reduces the system's energy efficiency.
Our diagnosis took place in several stages:
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Checking the electrical voltage : no anomalies.
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Communication test between indoor and outdoor units : stable signal.
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Refrigerant pressure check : level below factory specifications.
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Visual inspection of welds and fittings : presence of a slight oily trace near the service fitting.
These findings confirmed the presence of a micro-leak of R-410A refrigerant , the main cause of the reduced performance.
Leak repair and full return to service
After isolating the compressor, our technicians:
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Cleaned the fitting area with a specialist solvent to remove any traces of oil and make it easier to detect.
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Repaired the leak by silver re-soldering, then performed a nitrogen leak test to ensure the reliability of the seal.
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Pulled a deep 500 micron vacuum to remove any moisture in the circuit.
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Recharged the system with R-410A , according to Fujitsu recommendations (precise quantity adjusted to the nearest gram).
Once the recharge was complete, the heat pump was restarted. The measurements taken indicated an indoor-outdoor temperature difference of 23°C , proof that optimal performance had been restored.
Corrective maintenance and prevention advice
Taking advantage of the repair, we performed a thorough cleaning of the condenser to remove debris and vegetation from around the unit. We then applied a light anti-corrosion treatment to the fins to protect the unit from moisture and pollen.
We also made the client aware of some good practices:
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Prune plants around the compressor to maintain a minimum distance of 60 cm for free air circulation.
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Clean the internal filters every 4 to 6 weeks.
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Schedule annual AirGreen maintenance , including refrigerant level checks, electrical tests, and coil cleaning.
Result: restored efficiency and guaranteed comfort
After our intervention, the Fujitsu wall-mounted heat pump worked like new. Hot air was once again circulating efficiently in all rooms, and the customer noticed an immediate reduction in energy consumption .
This repair illustrates the AirGreen philosophy: combining technical rigor, speed of intervention and sustainable advice to maximize the performance of HVAC systems, whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore .
AirGreen expertise in action
Every service call is an opportunity for us to demonstrate our expertise and commitment. Our technicians are trained to work on all major brands, including Fujitsu, Gree, Midea, Sharp, Bosch, and Trane , with the same attention to detail and lasting results.
From our experience, we know that an ignored micro-leak or lack of maintenance can cut the lifespan of a heat pump in half. That's why we always favor a proactive approach , combining a complete diagnosis and personalized recommendations.
Conclusion
This Fujitsu heat pump repair in Outremont demonstrates how simple, neglected maintenance can lead to significant performance losses. Fortunately, thanks to our team's quick and accurate intervention, the customer's comfort was restored and their unit returned to full efficiency.
At AirGreen , we are committed to maintaining the reliability of your HVAC systems so your home remains comfortable year-round—summer and winter.
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