A typical service call in a Montreal apartment
At AirGreen , our technicians are regularly called upon to intervene in Montreal apartments where wall-mounted air conditioners are showing signs of weakness after several seasons of use. Recently, our team traveled to a home in the Côte-des-Neiges neighborhood for an urgent repair of a Gree wall-mounted air conditioner installed above an interior door—a common configuration in Montreal's urban apartments where space is limited.
The customer contacted us after noticing that their unit was no longer blowing cold air despite the operating indicator light being illuminated. An intermittent clicking noise accompanied startup, and the remote control no longer seemed to respond properly.
In-depth diagnosis: an electrical and communication problem
Upon our arrival, our technicians performed the usual checks: power supply voltage, electronic board, and internal connections. We quickly identified a problem with the wall control module (the small box attached to the wall to the right of the unit). This type of Gree control, connected directly to the indoor unit, can experience communication failures due to humidity or an electrical surge.
To confirm the diagnosis, we have:
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tested the continuity of the cable connecting the control to the main board;
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checked for 5 VDC at the signal connector;
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and measured the resistance of the ambient temperature sensor integrated into the control.
Measurements confirmed a short circuit in the control module , preventing the main board from activating the interior fan.
Repair: System replacement and reset
After isolating the problem, our team replaced the faulty wall control with a compatible original Gree module and then performed a complete system reset. This step is crucial, as simply disconnecting the power supply is not always enough to clear internal error codes from the board.
We then cleaned the evaporator coils using a no-rinse biodegradable cleaner , and checked the condensate drain—often responsible for water leaks in this type of compact installation.
Once everything was reassembled and tested, the air conditioner resumed normal operation:
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stable cold air from the first minutes;
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reduced operating noise thanks to a balanced fan;
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smooth communication between the control and the main board.
AirGreen Expertise: Precision and Cleanliness Above All
Every HVAC repair we perform in Montreal, Laval, or on the South Shore follows a rigorous methodology. In this specific case, the restricted access—just above a door—required careful handling to avoid damaging the casing or connections.
Our technicians have:
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protected the door frame and walls with security film;
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used an insulated clamp voltmeter for load testing;
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documented pre- and post-intervention measurements to ensure compliance.
This level of detail is part of our commitment to each customer: to provide professional, precise and lasting HVAC service .
Result: Restored comfort and peace of mind
The customer immediately noticed the difference: the room temperature returned to normal, and the remote control responded perfectly. We took the time to explain how to prevent future power surges—including using a surge protector on the power outlet and cleaning the filters every three months.
This repair once again demonstrates the importance of regular maintenance and professional diagnostics . A small electrical fault, left unattended, could have damaged the main board, leading to a much more expensive repair.
In summary
The repair of this Gree wall-mounted air conditioner in Côte-des-Neiges perfectly illustrates the combination of technical know-how and attention to detail that characterizes AirGreen. Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we put our expertise at the service of our customers' comfort, one device at a time.