A Telltale Service Call: Slight Signs, a Major Drainage Problem
At AirGreen , our technicians are often called upon to intervene for water leak problems on wall-mounted air conditioners , especially when the unit has not been cleaned for several seasons. This is exactly the case with this Midea wall-mounted air conditioner , installed in a house in Sainte-Julie , on the South Shore of Montreal .
When our client contacted us, she noticed water leaking down the wall just below the indoor unit. The moisture was starting to mark the paint, and she feared more extensive water damage. An appointment was quickly scheduled with one of our specialized technicians.
Diagnosis: A clogged drain and neglected maintenance
Upon arrival, we immediately noticed that the Midea wall unit was protected by a cleaning tarp – a method some homeowners use to attempt DIY maintenance. However, a cursory cleaning is often not enough to remove dust and mold buildup lodged in the evaporator fins and condensate tray .
After disassembling the front panel and removing the filters, we inspected:
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The condensate tray , partially blocked by a mixture of dust and biofilm.
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The drainage pipe , clogged halfway, causing water to back up.
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The evaporator coil is clogged and restricting the proper flow of condensates.
Through a drainage test , we confirmed that water was stagnating in the tray rather than draining properly.
Intervention: complete cleaning and unblocking of the drainage system
To resolve the issue, our team performed a complete service on the Midea indoor unit , following these steps:
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Protecting the work area with a waterproof cover and a collection bucket (visible in the photo).
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Injection of hot water under pressure combined with a biodegradable disinfectant product , in order to dissolve organic residues.
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Unblocking the drain using a condensate vacuum and a flow test with clean water.
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Complete cleaning of the evaporator coil , including the fan impeller, often neglected during amateur maintenance.
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Reassembly and performance test , with verification of air flow and blowing temperature.
The result was immediate: no more leaks, smooth flow in the drain, and air conditioning performance restored .
Why these breakdowns often occur in Sainte-Julie and elsewhere on the South Shore
South Shore homes often have finished basements where wall-mounted air conditioners are installed in more humid and less ventilated rooms. This accelerates the accumulation of mold and organic debris in condensate drains. Combined with maintenance spaced several years apart, this creates a breeding ground for internal water leaks .
At AirGreen, we highly recommend:
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Complete maintenance of the wall-mounted air conditioner once a year.
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Use a mild antibacterial product to prevent odors and organic deposits.
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An annual drain check to prevent progressive blockages.
A refurbished Midea air conditioner: comfort restored, humidity eliminated
At the end of the intervention, the client was able to see the difference:
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The blown air was fresher and healthier .
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The ambient humidity had decreased.
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No more traces of water on the wall.
We also recommended an annual AirGreen maintenance contract , guaranteeing regular monitoring and preventive inspections.
This repair perfectly illustrates our approach: accurate diagnosis, transparency, and durability . With every service call, our goal is simple— to restore the performance and extend the life of your HVAC units while ensuring your daily comfort.
In summary:
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Equipment Type : Midea Wall-Mounted Air Conditioner
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Problem : Water leak caused by a clogged drain
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Location : Sainte-Julie, South Shore of Montreal
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Solution : Complete cleaning, drain unclogging, performance test
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Result : No leaks, restored efficiency, cleaner air
At AirGreen, every HVAC repair is an opportunity to demonstrate our expertise and commitment to quality service — whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore .