When an interview becomes an emergency
In the middle of January, a client living in Montreal 's Saint-Laurent district contacted us urgently: his Fujitsu wall-mounted heat pump was blowing lukewarm air despite a plummeting indoor temperature. This unit, installed in a modern condo, is typical of wall-mounted HVAC systems used in multi-family buildings: compact and efficient, but sensitive to maintenance and dust accumulation.
Upon opening the front panel, the customer noticed clogged filters and a heat exchanger covered in a thin layer of dirt . This often trivial detail actually hid a common cause of underperformance.
Complete on-site diagnosis
Upon our arrival, we carried out a series of checks:
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Unit outlet blowing temperature : only 19°C, well below normal for a Fujitsu heat pump in heating mode.
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Condition of air filters : completely saturated with dust and household fibers.
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Inspection of the evaporator coil : presence of a slight oily deposit, sign of the beginning of a micro-leak of refrigerant.
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R-410A refrigerant pressure test : slightly below nominal values, confirming minimal but gradual loss.
Thanks to our electronic detection device, we were able to identify the exact source of the leak: a slightly loose expansion fitting .
Repair and refurbishment
We then carried out the following steps:
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Tightening the expansion fitting and replacing the sealing gasket;
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Complete cleaning of the indoor unit with dry steam, including the evaporator, flaps and condensate tray;
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Partial recharge with R-410A to restore the correct circuit pressure;
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Antibacterial disinfection of the evaporator coil to eliminate accumulated contaminants;
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Operation test at different power regimes.
After intervention, the blowing temperature rose to 36°C , and the electricity consumption stabilized within normal ranges.
Result: restored comfort and a healthier system
The customer immediately felt the difference: consistent heat, more powerful airflow, and quieter operation. This intervention demonstrates how simple neglected maintenance can lead to costly malfunctions.
We took the opportunity to schedule an annual interview and recommend some best practices:
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Clean filters every 3 to 4 weeks;
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Avoid obstructing the unit with furniture or curtains;
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Monitor for any unusual noises or smells ;
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Perform professional maintenance before each heating or cooling season.
AirGreen expertise at your service
At AirGreen , every service call is handled with care. We understand that behind every breakdown, there's an immediate need for comfort and reliability. Our certified technicians work on all major brands: Fujitsu, Gree, Sharp, Midea, Mitsubishi, Zephyr, Goodman , and many more.
We provide a complete on-site diagnosis , using the latest generation of electronic tools, and we always prioritize repair before replacement , when possible and safe.
Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our team remains available to quickly restore the optimal performance of your HVAC system.
Technical details of the Fujitsu case in Saint-Laurent
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Brand: Fujitsu
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Type: Wall-mounted heat pump (mini-split)
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Refrigerant: R-410A
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Problem: Minor leak and airflow obstruction
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Interventions: cleaning, tightening, partial recharging, disinfection
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Result: restored performance, optimal comfort, reduced consumption
Prevent to avoid breakdown
This case illustrates an essential truth: the majority of heat pump breakdowns are avoidable . Preventive maintenance carried out by a certified professional allows you to:
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Avoid refrigerant leaks ;
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Preserve indoor air quality ;
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Maintain maximum energy efficiency ;
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Extend the life of the compressor .
By choosing AirGreen, you benefit from a trusted partner, recognized for the quality of its service and its local know-how.