When a water flow problem disrupts the comfort of a Montreal apartment
At AirGreen , we are often called out for water leakage issues on wall-mounted units installed in modern condos or apartments in Montreal. This was recently the case in Outremont , where a client contacted us about an intermittent leak coming from their Mitsubishi wall-mounted air conditioner , hidden in a stylish recess above a built-in cabinet.
Diagnosis: A clogged drain and dust buildup on the evaporator
Upon arrival, we undertook a complete system diagnosis . The air conditioner, a Mitsubishi Inverter wall-mounted model , showed several telltale signs:
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Presence of water droplets on the lower facade.
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Slight internal gurgling noise, typical of a partially blocked drain pipe .
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Reduced airflow , indicating a clogged filter and turbine.
After dismantling the front cover and inspecting the condensate tray , we noticed an accumulation of algae and dust inside the drain, limiting the normal flow of condensed water.
Repair steps: cleaning, unblocking and checking the circuit
Our technician carried out a series of methodical and precise actions:
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Power cut to secure the intervention.
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Complete removal of the cover and air deflector , allowing direct access to the turbine and evaporator.
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Vacuum and clean the condensate tray using a specialized vacuum cleaner.
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Injecting compressed air into the drainage pipe to clear any blockages.
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Application of a mild biocide solution to prevent the return of bacteria and algae.
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Cleaning the coil with a non-corrosive foaming product, removing dust and greasy deposits.
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Rinse, dry and complete condensation flow test.
Once everything was reassembled, we restarted the system to observe its operation. The unit restarted silently, with a smooth flow of water and no leaks.
Result: a clean, quiet and perfectly functional air conditioner
In less than two hours, our team brought this Mitsubishi wall-mounted air conditioner back to life. The airflow returned to its normal intensity, temperatures dropped quickly , and most importantly, not a single drop of water was visible around the installation.
The customer appreciated the discretion of our intervention , carried out without removing the appliance from its recess. This type of targeted maintenance avoids costly disassembly and preserves the aesthetics of the high-end interior installations typical of Outremont.
Why these leaks are common…and how to prevent them
Water leaks on wall-mounted air conditioners are one of the most frequent calls we receive, especially during the summer .
They often result from:
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Clogged filters , blocking air circulation.
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Dirty or poorly leveled condensate tray.
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Drainage clogged by dust, spores or algae.
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Poor seasonal maintenance .
To avoid these inconveniences, AirGreen recommends an annual professional cleaning of your wall unit, including the coil, drain, and turbine. This not only prevents leaks, but also reduces electricity consumption and improves indoor air quality .
AirGreen expertise in Montreal and on the South Shore
Every service call is an opportunity for us to demonstrate our technical rigor and our commitment to the lasting comfort of our customers.
Our intervention in Outremont is part of our mission: to offer reliable, fast and precise HVAC solutions throughout Greater Montreal — Montreal, Laval, Longueuil, North Shore and South Shore .
AirGreen – Experts in Mitsubishi air conditioning and wall-mounted heat pumps in Montreal and its surrounding areas.
We provide diagnosis, maintenance and repair with care and precision, so that each unit regains its full efficiency.