Precision work on a balcony in downtown Montreal
At AirGreen , we are often called upon to intervene in urban contexts where space is limited, particularly in condo buildings in downtown Montreal . This is exactly the case with this Gree wall-mounted heat pump repair carried out in an apartment in the Ville-Marie sector, where the customer reported a sudden loss of performance and a complete shutdown of the heating on a cool spring evening.
A well-installed Gree heat pump, but one that can withstand the Montreal climate
The outdoor unit, a high-efficiency Gree model running on R-32 refrigerant , was mounted on a raised stand on the balcony. This type of installation is common in downtown condominiums: it ensures good ventilation while reducing the transmission of vibrations to the building structure. However, in an urban environment exposed to wind and dust, some components can deteriorate more quickly.
When our technician arrived on site, he found that the system was no longer starting , even though the power supply was active. The indoor unit was displaying an error code related to the communication between the two modules.
Step 1 – Complete diagnosis of the communication problem
Before any repair, we undertook a methodical analysis :
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Check the voltage at the compressor and the main electronic board.
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Inspection of the wiring between the indoor and outdoor unit .
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Checking signal connections (serial communication).
The verdict: a faulty external control board , likely caused by an electrical surge during a recent thunderstorm. This type of failure is common in urban environments, especially when the system is not protected by a suitable surge protector.
Step 2 – Electronic board replacement and system calibration
After explaining the situation to the customer and obtaining their approval, we proceeded to completely replace the control board with an original Gree part.
Our technicians then:
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Reconnected the wiring harness according to the manufacturer's diagram.
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Checked polarity and communication connections.
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Updated the synchronization settings between indoor and outdoor units.
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Reset the system to start a self-test cycle .
Within minutes, the Gree heat pump resumed normal operation, with smooth compressor start-up and stable airflow inside.
Step 3 – Performance Check and Prevention Tips
Once the repair was carried out, we checked:
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The compressor amperage rate (compliant values).
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The discharge and suction temperature .
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The time taken for the room to heat up .
The results were excellent: the heat pump regained 100% of its efficiency and a minimal noise level , proof of good mechanical balancing.
Before leaving the premises, our technician recommended to the owner:
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Install an HVAC surge protector to protect the new board.
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To carry out annual professional cleaning , especially in urban environments.
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Never obstruct ventilation grilles, especially on small balconies.
An exemplary intervention in the heart of Montreal
This type of call demonstrates how essential regular maintenance and rapid response to warning signs are to extending the life of a wall-mounted heat pump. Thanks to our expertise, the Ville-Marie customer was able to regain comfort the same day , avoiding a prolonged breakdown during the transition season.
At AirGreen , we pride ourselves on offering fast, accurate, and long-lasting HVAC repair services, whether in Montreal , Laval , Longueuil , the North Shore , or the South Shore . Our technicians are fully proficient with Gree , Sharp , Fujitsu , Midea , and many other popular brands in Quebec.