A mysterious water leak on a perfectly painted white wall
At AirGreen , we often troubleshoot Gree wall-mounted heat pumps , which are particularly popular in Montreal's modern condominiums and housing. Recently, a client in Rosemont–La Petite-Patrie contacted us after noticing brownish marks on his wall , just below his indoor unit. A trickle of water was slowly seeping out, leaving visible marks on the fresh paint.
Our mission: to identify the cause of the leak , correct the problem and restore comfort — without having to repaint the entire wall.
Initial diagnosis: the cause was not what it seemed
Upon arrival, our technicians observed several telltale signs:
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The Gree unit was working, but was producing an irregular flowing noise .
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The water trails ran straight down from the bottom center of the device.
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No damp smell was present, indicating a recent leak.
After removing the front hood, we quickly identified the source:
The condensate drain pipe was partially blocked by dust and algae deposits.
Result: the condensation water, instead of being directed outwards, overflowed through the internal tray and flowed down the wall.
Intervention: unblocking, cleaning and complete disinfection
Our experts applied the standard AirGreen procedure:
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Power cut for safety.
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Disassembly of the lower casing to access the recovery tank.
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Complete vacuuming of the condensate tray using a specialized water vacuum cleaner.
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Injecting compressed air into the drainage pipe , allowing the organic blockage to be released.
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Antibacterial cleaning using a biodegradable solution to prevent algae regrowth.
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Drainage test with 500 ml of water to confirm smooth flow to the outside.
The result was immediate: the system resumed normal operation , without leaks or abnormal noise.
Checking the refrigeration circuit and performance
While the unit was open, our technician took the opportunity to perform a complete performance inspection :
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Stable refrigerant pressure at 115 psi ,
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Blown air temperature at 10.6°C in air conditioning mode ,
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Consumption of 3.8 A , perfectly within Gree specifications.
This additional check helps ensure the system's energy performance and prevents another problem (e.g., a frozen evaporator) from hiding behind the leak.
Practical advice given to the client
After repair, we explained to the customer that:
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An annual maintenance could have prevented this obstruction,
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It is recommended to have the filters cleaned every 6 to 8 weeks , especially during the summer period,
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And regularly observe the area under the unit to detect any traces of humidity at the first signs.
We also offered him an AirGreen maintenance contract , which includes a complete cleaning of the indoor unit and drain twice a year.
Result: dry wall, clean air and restored performance
A few hours after our departure, the customer called us back to thank us:
the wall had begun to dry and the room temperature had returned to an optimal level.
The Gree device was now operating quietly, efficiently and leak-free .
AirGreen Expertise: When Precision Makes All the Difference
This type of intervention perfectly illustrates our philosophy:
diagnose rigorously, repair carefully, and inform the customer to avoid recurrences.
A simple water leak may seem harmless, but if left untreated, it can cause:
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aesthetic damage to the walls ,
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mold around the drain,
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and premature wear of the fan motor due to excessive humidity.
Thanks to our methodical approach, this Gree system in Rosemont has regained its full effectiveness—and its wall, its shine.
AirGreen: Your HVAC Partner in Montreal and Beyond
Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our teams are trained to work on all recognized brands: Gree, Mitsubishi, Fujitsu, Midea, Sharp, Zephyr, Trane, Bosch, and many others .
With AirGreen, every service call becomes a sustainable solution—for your comfort and peace of mind.