A breakdown in the city center: a Fujitsu air conditioner is out of breath
In a modern condo in the Ville-Marie district of Montreal, our AirGreen team was recently called to address a performance issue with a Fujitsu wall-mounted air conditioner . The customer noticed that the indoor unit was no longer cooling his space efficiently, even at full power. In addition, a slight flickering on the unit's indicator light indicated a malfunction.
Complete diagnosis: dirt, sensors and blocked drain
Upon arrival, we carried out a complete diagnostic . The Fujitsu unit, a compact wall-mounted model, showed several telltale signs:
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The evaporator coil was partially clogged with accumulated dust and grease.
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The air filters had not been cleaned for several months.
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A buildup of water in the condensate pan indicated a partially blocked drain .
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The room temperature sensor was showing an incorrect reading, which was distorting the automatic control.
These combined symptoms resulted in decreased system performance and unnecessary power consumption.
Steps of repair
Our technician undertook a complete overhaul of the Fujitsu indoor unit :
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Deep cleaning of the evaporator coil using a specific biodegradable HVAC cleaner.
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Wash the air filters and dry them thoroughly before reinstallation.
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Clear the condensate drain using a vacuum pump to remove any obstructions.
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Checking electrical connections and tightening power terminals.
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Replaced the internal temperature sensor to correct the erroneous reading.
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Performance test in cooling mode and dehumidification mode.
As soon as it was switched on again, the airflow returned to normal and the temperature in the room quickly dropped.
Preventive Maintenance Tips for Fujitsu Wall-Mounted Air Conditioners
To avoid such a breakdown in the future, we recommended AirGreen seasonal maintenance to the customer, including:
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A complete cleaning of the indoor coil and outdoor condenser before each summer.
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Check the condensate drain twice a year.
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A check of R-410A refrigerant pressures to ensure proper system balance.
This type of preventive maintenance not only extends the life of the heat pump or air conditioner, but also ensures optimal energy efficiency and consistent indoor air quality .
AirGreen expertise serving downtown Montreal
Working in apartment buildings like those in Ville-Marie requires specific logistics:
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Limited access to balconies and terraces for outdoor units.
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Strict compliance with co-ownership regulations regarding noise and operating hours.
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Safe handling of cleaning equipment and fluids.
Our technicians, trained for these urban environments, ensure fast, clean, and compliant interventions. At AirGreen, we understand that each building—whether it's a condo in the Old Port, an office in Ville-Marie, or an apartment in Verdun—requires an approach tailored to its architecture and energy needs.
Result: immediate comfort and restored efficiency
Following our intervention, the Fujitsu air conditioner returned to optimal operation. The customer noted a rapid drop in room temperature and an improvement in perceived air quality. The unit, now clean and calibrated, will provide stable performance throughout the summer season.
This intervention demonstrates the importance of regular, professional maintenance for any wall-mounted air conditioning unit. At AirGreen, we ensure that every customer in Montreal, Laval, Longueuil, on the North Shore, or the South Shore enjoys lasting comfort, supported by transparent and rigorous service.