In a condo in Ville-Marie , right next to a large patio door, comfort had suddenly taken a turn for the worse: lukewarm air in air conditioning mode, uneven airflow… and above all, water leaking and starting to stain the wall under the indoor unit. The kind of situation where you want a quick, clean, and above all, lasting solution.
At AirGreen , we often work in situations like this: a wall unit installed near the ceiling , above a glass access point, with space constraints (curtains, tracks, blinds, furniture). It's typical of downtown condos: efficient, discreet… but it requires precise repair and a complete overhaul, not just a quick check.
What the photo tells us (and what that changes regarding the repair)
We see an indoor wall unit installed high up, in a corner near a patio door. This position is very common, but it presents two challenges:
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Condensation and drainage : when the drain becomes clogged (dust, biofilm, residue), the water no longer drains properly and ends up overflowing into the collection tank .
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Dirt accumulation : In a condo, especially near a balcony or glass door, fine particles (urban dust, pollen, light soot) quickly settle. The result: a clogged turbine , a dirty heat exchanger, reduced efficiency, and possible odors.
Machine type: wall-mounted heat pump (indoor unit)
This is clearly a Fujitsu wall-mounted heat pump (indoor unit). Although the photo doesn't show the outdoor unit, the design and shape are typical of residential mini-split systems.
Model (chosen in a consistent manner)
The exact model is not visible in the photo. To remain consistent with a residential installation in Greater Montreal and the current product line, we will refer to a Fujitsu Orion (XLTH) series wall-mounted heat pump , a common choice for those seeking a high-performance heating/cooling system. (If the unit turns out to be a different Fujitsu series during the service call, our diagnosis and procedures remain the same: the condition of the drainage system, heat exchanger, sensors, and pressures will determine the repair.)
Symptoms reported by the customer
In this case, the typical symptoms were:
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Less efficient cooling (air that seems “tired”)
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Inconsistent airflow
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Water leaking or abnormal humidity under the unit
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Sometimes: a musty smell at startup (a classic sign of stagnant moisture and dust)
This mix of symptoms almost always points to a combination: partially blocked drain + clogged heat exchanger/turbine .
Our AirGreen diagnostic (on-site method)
Before disassembling anything, we apply a simple, but very reliable diagnostic routine:
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Checking the mode and instructions (remote control, desired temperature, fan speed)
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Reading the actual symptoms : blowing temperature, stability, compressor response (via functional tests)
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Inspection of the condensate tray and drain : water level, flow rate, pipe slope, signs of overflow
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Visual inspection of the heat exchanger (coil) and turbine : if it is loaded, the efficiency drops and the condensation becomes more “disorganized”.
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Basic electrical checks : connections, signaling, temperature sensors (thermistors) if abnormal behavior is observed
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Performance check : pressures/operating parameters if necessary (depending on access and symptoms)
In this specific case, the determining factor was clear: presence of stagnant water and insufficient flow → compromised drainage.
The repair steps (clean, complete, and long-term oriented)
1) Area protection (condo = zero damage)
In Ville-Marie, we often work in enclosed spaces, near furniture and sensitive surfaces. Therefore, we have:
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protected wall/floor,
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installed a recovery device,
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secured the area around the patio door and curtains.
2) Unblocking the condensate drain
Next we have:
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cleared the drain
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eliminated the biofilm (the invisible “sludge” that blocks),
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checked the slope and the actual flow
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tested the drainage with controlled flushing.
Objective: zero overflow , even on very humid days when the unit produces a lot of condensation.
3) Technical cleaning of the heat exchanger and turbine
This is the part that too many “express” repairs ignore… and this is precisely what makes the difference after a few weeks.
We have :
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cleaned the heat exchanger (coil) to restore heat exchange,
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cleaned the turbine (blower) to restore a stable airflow,
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treated areas where moisture clings (sources of odors and bacteria).
4) Functional checks (cooling + heating)
After reassembly, we carried out comprehensive tests:
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fan stability
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blowing temperature,
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Cyclical behavior
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Total absence of water in the tank under normal conditions (drain doing its job).
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noise level (important in condos).
Result: restored comfort, stabilized performance, reassured customer
Once the repair is complete, the change is usually immediate:
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Cooler air in air conditioning , more constant.
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significantly improved airflow
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elimination of the risk of water leaks ,
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quieter operation (especially after turbine cleaning)
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And most importantly: the customer regains confidence in their system.
In a Ville-Marie condo, it's also a matter of peace and quiet: a leaking wall unit isn't just a nuisance… it can quickly escalate into a major issue involving walls, paint, and even building management. Our approach therefore aims to correct the cause , not just the symptoms.
Why do these breakdowns happen (and how to avoid them)?
Without being preachy: a wall-mounted heat pump, even a Fujitsu one , needs a minimum of preventative maintenance.
Our simple recommendations:
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Filters : light, regular cleaning (especially in summer)
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Complete cleaning (heat exchanger + turbine + drain): periodically, depending on usage
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If you notice: odor, droplets, decreased yield → intervene early to prevent damage
AirGreen in Ville-Marie: clean and controlled condo interventions
Condo repairs require real discipline: access, noise, cleanliness, and respect for the spaces. At AirGreen , we are used to urban installations (patio doors, alcoves, low ceilings, air circulation constraints) and we adapt our method to ensure that the repair is efficient, discreet, and long-lasting .