An air conditioning failure in a typical Montreal building
At AirGreen , we regularly work in apartment buildings in Côte-des-Neiges–Notre-Dame-de-Grâce , an area where Fujitsu wall-mounted air conditioners are very popular for their reliability and compactness. Today's call was from a concerned landlord: one of his tenants was complaining that the wall-mounted unit was no longer producing cold air, despite a normal operation indicator on the remote control.
A typical Montreal environment
The installation was located on the back wall of a brick building, typical of Montreal duplexes and triplexes. Three wall-mounted units were aligned under metal balconies—a common installation context, but one that often caused airflow problems and difficult maintenance . The Fujitsu unit in question, mounted on a wall bracket, showed obvious signs of aging: dirty fins, dull paint, and, above all, a regular clicking noise each time it was started.
Diagnosis: abnormal noise and no cold
Our technicians carried out a complete diagnosis on site:
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Electrical inspection : voltage stable at 240 V, but a slight phase shift detected due to an internal relay.
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R-410A refrigerant pressures : lower than normal values (220 psi instead of 300 psi at 25°C).
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Mechanical noise identified : exterior fan slightly off-center.
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Reduced cooling capacity : indoor evaporator blowing at 19°C, far from the expected 12-14°C.
These results clearly pointed towards a micro-leak of the refrigerant combined with a misalignment of the fan motor , probably caused by repeated vibrations of the unit fixed too close to the metal guardrail.
AirGreen intervention: precision and rigor
Our technicians took care of the repair step by step:
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Complete cleaning of the outdoor condenser with a low pressure biodegradable degreaser.
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Readjusted the fan and tightened the anti-vibration mounts.
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Leak test with an electronic detector: minimal leak detected on a solder joint of the service connection.
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Repair of the leak by silver soldering and calibrated filling of R-410A according to Fujitsu specifications.
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Checking pressures and temperatures under load: 310 psi discharge, 125 psi suction, temperature delta compliant.
Finally, a 30-minute performance test confirmed the return of optimal cooling, with a blowing temperature stabilized at 11.8°C.
Result: restored comfort and secure installation
The owner and tenant could immediately see the difference: the noise was gone, the airflow was constant, and the room was feeling fresh again. Our technicians also installed additional anti-vibration pads under the wall bracket legs, reducing the transfer of vibrations to the balcony structure.
Recommendations and prevention
To avoid the return of such a problem, we advised:
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Annual preventive maintenance of each wall unit.
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A clearance of at least 30 cm around the condenser to facilitate airflow.
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Check the fixings every two years, especially on brick walls exposed to freezing and thawing.
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Use of a voltage protector (SurgeGuard type) to protect the electronic card during current variations.
Why this type of intervention is common in Montreal
Buildings in Côte-des-Neiges , like many others in downtown Montreal, often have high-rise or balcony installations , which complicate maintenance and promote overheating of outdoor units. These conditions can accelerate wear on fan motors and cause micro-leaks in copper fittings.
Thanks to our experience in these dense urban environments, AirGreen adapts its intervention methods to each situation - whether for Fujitsu, Gree, Midea or Sharp wall-mounted air conditioners , we always guarantee optimal and lasting performance after each repair.
AirGreen expertise: interventions designed to last
Our team ensures that every repaired unit returns from its problematic state to its original performance, or even better. In this case, the combination of precise mechanical realignment and accurate refrigerant refilling prevented a more serious compressor failure while extending the system's lifespan.
Every detail counts: it is this philosophy that allows us to remain the benchmark in HVAC maintenance and repair in Montreal, Laval, Longueuil, on the North Shore and the South Shore .
AirGreen , experts in Fujitsu wall-mounted air conditioner repair in Montreal, guarantees fast, durable interventions that comply with the strictest standards in the Quebec HVAC sector.