When Performance Drops: The Importance of Accurate Maintenance and Diagnosis
At AirGreen , we operate daily throughout Montreal and the North Shore to diagnose and repair underperforming HVAC systems. Recently, our team was called to Saint-Léonard for a service call regarding a Fujitsu wall-mounted air conditioner that was no longer cooling properly. The temperature measured at the air outlet was 24.8°C , a clear sign that something was wrong.
Initial diagnosis: an often underestimated problem
Upon arrival, we noticed that the air filters were visibly clogged . The indoor unit had a significant buildup of dust on the grilles and coils, which significantly restricted airflow. This type of neglect not only reduces the system's efficiency, but can also cause:
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Overheating of the external compressor .
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Increased energy consumption .
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Premature deterioration of electronic components.
We started with a series of systematic checks, including:
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Temperature measurement at the air inlet and outlet using an infrared thermometer.
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Inspection of the evaporator coil for possible grease deposits.
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R-410A refrigerant pressure test (used on most Fujitsu models).
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Electrical analysis of connections and control board.
Technical intervention: return to optimal performance
After identifying the root cause – restricted airflow due to clogged filters and a dirty coil – we proceeded to:
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A complete cleaning of the filters and coil with a specialized biodegradable cleaner.
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Checking the tangential fan , in order to eliminate any accumulation of dust which could unbalance the rotor.
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A check of the temperature sensors , often the cause of erroneous readings in Fujitsu systems.
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A drainage test , to ensure that no blockages are causing leaks or stagnant water in the condensate tray.
Once these steps were completed, we restarted the system. The difference was immediate: the blowing temperature dropped to 11.2°C , indicating a return to normal performance.
Results and recommendations to the client
The owner, impressed by the speed of the diagnosis, appreciated our educational approach. We explained to him that regular filter cleaning is essential—ideally every 4 to 6 weeks during the air conditioning season—and that annual professional maintenance allows for:
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Maintain maximum energy efficiency.
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Extend the life of the compressor and electronic boards.
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Prevent costly breakdowns during hot weather.
We also recommended a complete maintenance of the outdoor condenser , as dust and pollen accumulated in the fins reduce the heat dissipation capacity.
Why trust AirGreen for your HVAC repairs in Montreal
By choosing AirGreen , you benefit from a local and fast service, provided by certified technicians who master the biggest brands on the market: Fujitsu, Gree, Sharp, Lennox, Midea, Goodman, and many others . Our approach is distinguished by:
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Accurate diagnostics supported by professional tools.
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Meticulous interventions respecting CSA and BNQ standards.
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A transparent service , with clear explanations at each step.
Whether you are in Montreal , Laval , on the North Shore or the South Shore , our team is available to refurbish your HVAC systems, whether it is a wall-mounted heat pump repair , a central air conditioner or a multi-zone system .
Conclusion: comfort restored thanks to careful intervention
This repair in Saint-Léonard perfectly illustrates the importance of regular maintenance and rigorous diagnostics . The Fujitsu wall-mounted air conditioner, now fully functional, once again ensures optimal comfort while reducing the household's electricity consumption.
At AirGreen , each intervention is an opportunity to demonstrate our know-how and our commitment to offering sustainable solutions for the comfort of homes in Greater Montreal.