Preventive maintenance becomes necessary repair
In the middle of January, a client in Montreal's Côte-des-Neiges neighborhood contacted us for a complete cleaning of their Fujitsu wall-mounted heat pump . The service was supposed to be routine—preventative maintenance—but our inspection quickly revealed a drainage problem that could damage the circuit board and affect the system's performance. At AirGreen , every service becomes an opportunity to prevent more costly breakdowns.
Inspection and initial findings
The customer noticed that their wall-mounted heat pump was dripping slightly along the interior wall after a heating cycle. During our visit, we installed our professional cleaning tarp for a thorough cleaning of the coils and fins. Within minutes, our technicians noticed that the condensate drain was partially clogged , causing water to back up inside the unit.
The unit—a high-efficiency Fujitsu model —also had a buildup of dust and biofilm on the heat exchanger, a common problem when annual cleaning is neglected.
Complete diagnosis and intervention plan
After a detailed inspection:
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The fan motor was working properly.
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The interior temperature sensor was responding well.
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The drainage, however, had to be completely cleaned and disinfected.
Our team therefore undertook a complete cleaning and unblocking operation , including:
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Removing the front cover and washable filter .
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Low intensity pressure cleaning of coils using a specialized biodegradable detergent.
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Disinfection of the condensate tray and the drain pipe , eliminating mold and limescale deposits.
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Verification of flow rate in simulated cooling mode.
An unexpected discovery
While flushing the drain pipe, our technicians found a compacted clump of dust mixed with textile fibers . A blockage of this type may seem minor, but it prevents the proper flow of condensed water and can, over time, cause:
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wall leaks ;
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internal corrosion ;
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and even a short circuit on the main board.
Fortunately, rapid intervention prevented this damage.
Immediate results and satisfied customer
After cleaning, the heat pump regained optimal air circulation . The heating mode test confirmed a stable and uniform temperature increase. The unit operated quietly, proving that cleaning the fan blades had eliminated rotational imbalances.
The customer also noted a reduction in power consumption , a sign that the compressor no longer had to compensate for a loss of efficiency due to dirt.
AirGreen's advice to avoid this type of breakdown
At AirGreen , we recommend professional maintenance at least once a year , ideally in the fall before the heating season.
Some simple tips:
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Clean filters every 4 to 6 weeks.
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Make sure the drain is not blocked or kinked.
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Avoid using harsh household products that can damage the fins.
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Monitor the drains after each major cleaning.
Regular maintenance extends the life of the unit and ensures consistent comfort while maintaining excellent indoor air quality.
AirGreen expertise in the Montreal residential sector
Our team operates throughout Greater Montreal: Montreal, Laval, Longueuil, North Shore and South Shore . We specialize in the repair and maintenance of Fujitsu, Gree, Sharp, Midea, Daikin and Mitsubishi wall-mounted heat pumps , whether it's a simple cleaning, an electronic board replacement or a refrigerant recharge.
Our technicians have cleaning equipment under airtight tarpaulin, guaranteeing an intervention without splashes or dirt , even in the restricted spaces typical of Montreal apartments.
Conclusion
This repair and maintenance of a Fujitsu wall-mounted heat pump in Côte-des-Neiges demonstrates the importance of rigorous monitoring. A simple abnormal flow can mask the beginnings of a blockage which, if not addressed in time, leads to a costly breakdown. Thanks to AirGreen's expertise, the client regained perfect comfort, a sanitized system, and optimal energy efficiency.