A careful intervention to solve a water drainage problem
At AirGreen , we work daily on residential HVAC systems in Montreal, Laval, the North Shore, and the South Shore. Among our recent service calls, one from a customer in Outremont perfectly illustrates the importance of regular maintenance on Fujitsu wall-mounted heat pumps .
The customer contacted us after noticing a water leak along the wall , just below his wall-mounted unit. Fearing a refrigerant issue, he decided to turn off the system before we arrived—a prudent move we recommend to any homeowner facing a similar situation.
Initial diagnosis: a drain clogged by the accumulation of dust and biofilm
Upon opening the front panel, our technician observed an irregular flow of condensate . A quick drainage test confirmed that the drain pipe was partially blocked by organic residue , causing water to back up inside the chassis.
This type of breakdown, typical in the summer period, often occurs after several seasons without complete cleaning of the condensate tray and the drainage pipe .
Technical steps of the intervention
To restore system performance, our team followed a structured method:
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Installation of a professional washing cover to protect walls and furniture.
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High pressure cleaning of the indoor coil using a specialized biodegradable HVAC detergent.
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Completely clear the drain pipe using a reverse column vacuum.
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Checking the discharge flow rate by testing the system with a controlled filling of the tank.
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Cleaning the air filter and inspecting the tangential fan to remove any residual moisture.
Result: restored performance and comfort regained
After the repair, the Fujitsu unit returned to optimal operation, without noise or leaks. The customer noted that the airflow was more powerful and the set temperature was reached more quickly. These signs confirm improved energy efficiency and better indoor air circulation .
Why this problem is common
Fujitsu wall systems are known for their reliability, but like any HVAC unit, they require annual maintenance to prevent:
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internal water leaks due to a blocked drain;
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bad odors due to stagnant condensates;
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overheating of the fan motor caused by accumulated moisture;
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energy efficiency loss of up to 15%.
The AirGreen solution: maintenance and prevention
At AirGreen, we recommend complete preventative maintenance at least once a year, including:
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cleaning the coil and drain;
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checking the refrigerant level (R-32 or R-410A depending on the model);
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inspection of electrical connections and control board;
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the performance test in cold mode and heat mode.
Our certified technicians use professional equipment and comply with Quebec environmental standards, guaranteeing safe and sustainable service.
A relationship of trust built on transparency
At the end of the service, we presented the client with a detailed report, including before/after photos of the cleaning. He was impressed by the visual difference inside the unit and chose to add his annual AirGreen maintenance contract to prevent any future inconvenience.
At AirGreen , we believe that a well-maintained system is a system that lasts. Our interventions combine technical rigor, speed and respect for the customer , to ensure constant comfort, summer and winter.