An accurate diagnosis for restored performance
At AirGreen , we recently responded to a service call in Rosemont–La Petite-Patrie , in the heart of Montreal, for a customer whose Fujitsu wall-mounted heat pump was no longer cooling efficiently. On a particularly hot day, the ambient temperature remained around 27°C despite the setpoint being set at 20°C. Our mission: to quickly identify the cause and restore the HVAC system to full performance .
Symptoms observed
Upon arrival, we noticed that the indoor unit appeared to be working—the fan was blowing, the lights were on—but the expelled air remained lukewarm. The customer had already cleaned the filters, with no noticeable improvement. This situation indicated a refrigeration problem or a fault in the electronic communication between the units.
Stages of technical diagnosis
Our technicians followed a rigorous procedure in several phases:
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Checking the supply and return temperatures : using a professional infrared thermometer , we measured an air outlet at 14.7°C , confirming that the compressor was starting but that the refrigeration cycle was insufficient.
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Electrical Connection Inspection : All wiring between the wall unit and the outdoor condenser has been tested to ensure stable communication.
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Checking the refrigerant level : the pressure measured outside showed a slightly low level , probably linked to a micro-leak at the flare connection.
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Leak Detection : Using an electronic detector and specialized soap, we located a minor leak on an original seal.
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Repair and re-brazing : The fitting was disassembled, re-brazed with silver, then placed under full vacuum before recharging with R-410A refrigerant according to the manufacturer's specifications.
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Final performance test : after return to service, the blowing temperature dropped to 11°C , demonstrating a return to optimal cooling capacity.
Results obtained
Thanks to this intervention, the Fujitsu heat pump regained its full power. The customer immediately noticed a difference: indoor comfort was restored in less than 15 minutes , and energy consumption stabilized.
The highlights of this recommissioning:
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Refrigerant cycle restored with balanced pressure
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Complete leak elimination and permanent sealing
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Cold air temperature in accordance with manufacturer standards
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No vibration or abnormal noise , a guarantee of durability
AirGreen expertise: precision and rigor
Our certified technicians handle Fujitsu, Sharp, Midea, Lennox, and Gree heat pumps daily. Each service call is approached with the same method: meticulous diagnosis , precision tools , and total transparency with the customer . In this specific case, the speed of intervention and the use of an infrared thermometer with laser sighting allowed us to instantly confirm the return to nominal performance.
Recommended preventive maintenance
To prevent similar problems from recurring, we have recommended:
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Complete cleaning of the internal turbine every 12 months
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An annual check of the refrigerant level
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Replacing washable filters with each change of season
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An inspection of the flare joints with a torque wrench to prevent any micro-leaks
Conclusion: comfort and reliability found in Montreal
This intervention in Rosemont–La Petite-Patrie perfectly illustrates the AirGreen philosophy: diagnose precisely, repair sustainably, and guarantee constant comfort .
In less than two hours, our team brought a Fujitsu wall-mounted heat pump back to life thanks to precise measurements and field expertise recognized throughout Greater Montreal .
The end result: a high-performance Fujitsu heat pump, a satisfied customer, and a cool interior even on the hottest days of Montreal's summer.