When a leak on the wall reveals a drainage problem
At AirGreen , we regularly receive service calls for wall-mounted air conditioners that appear to be working properly, but are causing a visible water leak on the wall. This is exactly the case with this Gree wall-mounted air conditioner installed in a residence in Saint-Bruno , on the South Shore of Montreal .
The image sent by the customer spoke for itself: brownish traces coming down from the wall , just below the indoor unit. This typical sign indicates a condensate drainage problem , often caused by a blockage in the drain pipe or an incorrect installation slope.
Quick and accurate diagnosis: a leak due to a blocked pipe
Upon our arrival, our technician carried out a complete diagnosis of the system :
-
Checking the slope of the drain from the unit's drain pan to the outlet point.
-
Inspect the drain pipe for any clogs of dust, algae or debris.
-
Check the installation level of the indoor unit , as slight misalignment may prevent water from draining properly.
Upon removing the front panel, we found that the drain pipe was partially blocked by a buildup of dust and biofilm – a common mixture in wall-mounted systems often operating in dehumidification mode.
Intervention: complete cleaning of the condensate circuit
To put the system back in order, our team proceeded to:
-
Complete cleaning of the collection tray inside the Gree unit.
-
Vacuum the drainage pipe using a specialized vacuum cleaner to remove any obstructions.
-
Injection of a biodegradable antibacterial cleaner to prevent future algae growth.
-
Check the flow rate at the outlet to ensure that the condensate drains freely.
Once the work was completed, we performed an extended test of the system in air conditioning mode , confirming continuous and stable flow without any leaks.
Results: dry wall, functional system and reassured customer
After cleaning, the wall was wiped down and disinfected to remove any moisture. We recommended that the client repaint the affected area after it was completely dry to prevent future discoloration.
The Gree wall-mounted air conditioner now operates quietly , with perfect drainage and restored comfort. The relieved customer also signed up for our annual AirGreen maintenance program , which includes drain and coil cleaning to prevent the problem from recurring.
AirGreen Lessons and Recommendations
Water leaks from a wall-mounted air conditioner are almost always related to:
-
a blocked drain ,
-
an installation without sufficient slope ,
-
or insufficient maintenance .
At AirGreen, we advise all our clients to:
-
have their wall unit cleaned at least once a year;
-
check that the drainage pipe is not twisted or obstructed;
-
avoid blocking the water outlet from the drain outside the house (often blocked by snow or dust).
AirGreen: HVAC expertise serving the South Shore and Greater Montreal
Thanks to our certified and experienced technicians , AirGreen responds quickly in Montreal, Laval, Longueuil, the North Shore and the South Shore to diagnose and repair all brands of heat pumps and wall-mounted air conditioners , including Gree, Fujitsu, Midea, Mitsubishi, Sharp, Zephyr , and many others.
Our priority: restoring your comfort while ensuring the durability of your HVAC equipment .
Similar problem?
A water leak in your wall is never trivial. Contact AirGreen today for a professional inspection —before moisture damages your home.