Electrical failure on rooftop unit quickly brought under control
At AirGreen , we regularly work on HVAC installations located on the flat roofs typical of commercial and residential buildings in Saint-Lambert. Recently, our team was called to repair a Gree wall-mounted heat pump installed on the roof of a multi-family building. The outdoor unit, although new, had completely shut down after a sudden breakdown of the air conditioning system.
Initial diagnosis: identifying a power supply failure
Upon our arrival, we performed a complete electrical check of the unit. The owner had noticed that the compressor was no longer starting, although the indoor thermostat appeared to be working. After testing, our technician quickly discovered a power outage between the main circuit breaker and the unit's input terminal.
Visual inspection revealed a poorly protected connection at the inlet of the condenser's electrical box . Rainwater had infiltrated, causing slight corrosion on the terminals and oxidation of the power cable.
Steps of repair
Our technicians proceeded rigorously:
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Cut off the general power supply and secure the workstation.
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Complete removal of the connection box for cleaning and drying.
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Replacement of oxidized connectors with new generation waterproof terminals.
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Re-insulation around electrical cables to prevent further infiltration.
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Checking the supply voltage and compressor starting currents.
Once this work was completed, we put the unit back into service and measured the refrigeration circuit pressure , confirming the correct operation of the compressor and fan .
A system restored to full efficiency
After restarting, the Gree heat pump immediately returned to its normal operating cycle. Pressure and temperature values were perfectly within the manufacturer's recommended parameters. The customer noted a resumption of efficient cooling in the areas served by the indoor wall units.
We also took advantage of this intervention to recommend annual preventive maintenance , including cleaning the coils, tightening the electrical connections and checking the condensate drain - all essential elements to guarantee the durability and energy performance of the system.
What this intervention teaches us
Power outages on rooftop heat pumps are common, especially when the electrical connections are not fully protected against the elements. At AirGreen, we emphasize the importance of:
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Check outdoor power boxes regularly.
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Ensure that electrical connections are properly sealed.
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Clean the condenser coils to prevent overheating.
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Call a certified technician for any electrical diagnosis.
Why use AirGreen in Saint-Lambert?
As a company specializing in HVAC system repair in Montreal, Laval, Longueuil, on the North Shore and the South Shore , we have solid experience with Gree, Fujitsu, Sharp, Midea, Zephyr units and several other brands commonly used in Quebec. Our interventions combine speed, precision and transparency , with clear technical reports and recommendations tailored to each client.
Every repair is an opportunity for us to prevent future breakdowns and optimize the system's energy efficiency. This attention to detail sets us apart and allows us to maintain the trust of our residential and commercial customers throughout the greater Montreal area.
In conclusion
This Gree heat pump repair in Saint-Lambert perfectly illustrates the importance of regular maintenance and adequate protection of electrical components . Thanks to our rapid and methodical intervention, the building's interior comfort was restored in less than two hours, once again demonstrating AirGreen's reliability and rigor in the field of heating, ventilation and air conditioning .