A call received after water drops on the living room wall
On a rainy day in March, our AirGreen team was contacted by a resident of Montreal's Rosemont–La Petite-Patrie neighborhood. His Fujitsu wall-mounted heat pump system — a 12,000 BTU Halcyon model—was leaking water down the living room wall, just below the indoor unit. In addition to visible moisture stains, a gurgling noise could be heard every time the compressor restarted.
As is often the case with wall-mounted systems, a drainage problem can quickly disrupt indoor comfort. Our team responded within two hours of the call, equipped to perform a complete on-site diagnosis.
Condensate leak inspection and diagnosis
As soon as the front hood was opened, our technician noticed:
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An air filter partially clogged with dust.
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A condensate tray saturated with stagnant water.
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A drainage pipe partially blocked by algae and dust buildup.
During normal operation, the condensation generated by the cooling coil drains to the outside by gravity. In this case, the blockage caused water to back up to the front outlet, hence the leaks observed on the green wall of the living room.
Steps of the repair carried out by AirGreen
Our technicians followed a precise procedure to restore system performance:
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Power supply cut-off to ensure safe intervention.
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Disassembly of the cover and front fairing of the wall unit.
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Complete vacuuming of the condensate tray using a specialized water vacuum cleaner.
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Cleaning the drain pipe with a disinfectant solution and a jet of compressed air.
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Inspect the coil for frost or debris.
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Restart and complete test of airflow and drainage.
During the test phase, the system drained water properly, and condensation flowed freely to the outside. The customer was immediately able to notice the disappearance of the gurgling noise and the absence of any leaks.
Technical analysis: causes and prevention of this type of breakdown
Fujitsu wall-mounted heat pumps , renowned for their reliability, require regular drainage system maintenance. In Montreal homes, the combination of dust, humidity, and slight variations in the indoor unit's tilt can contribute to the accumulation of stagnant water.
The main causes of this type of problem are:
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Clogged air filter causing excess condensation.
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Drainage pipe slightly bent or raised after improper cleaning.
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Clogged condensate tray.
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Presence of biofilm (algae) inside the pipe.
At AirGreen, we encounter this situation several times a week, especially in the spring when the units alternate between heating and cooling.
AirGreen Maintenance Recommendations
To avoid any recurrence of water leaks, we advised the customer:
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Clean the filters every four weeks during the summer.
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Have the drainage checked before each hot season.
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Keep the unit perfectly horizontal after any maintenance or moving of furniture.
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Schedule a complete annual AirGreen maintenance , including coil cleaning, condensate tray disinfection and drainage system testing.
These simple measures help preserve system performance and longevity, while reducing power consumption.
Comfort restored and customer satisfied
Once the heat pump was back in operation, the room temperature returned to a stable state, and no water droplets were visible on the wall. Airflow was once again consistent, and the Fujitsu system resumed its usual quiet operation.
The client has chosen to join our AirGreen Montreal maintenance program , which guarantees priority intervention and a complete cleaning at each change of season.
AirGreen expertise: fast and precise HVAC service
At AirGreen, we operate throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore , for all types of wall-mounted heat pump repairs , whether Fujitsu, Gree, Midea, Sharp, Bosch or Lennox.
Our certified technicians provide:
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Accurate and transparent diagnostics .
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Durable repairs with original parts.
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Fast local service adapted to the realities of the Quebec climate.
Every service call is an opportunity for us to restore not only thermal comfort, but also the confidence of our customers .