Successful winter intervention for a failed central system
At AirGreen , we know how essential an efficient heating, ventilation and air conditioning (HVAC) system is, especially during Quebec's cold months. Recently, our team was called to Boisbriand , on the North Shore , to repair a GREE central heat pump that refused to start in the middle of March.
The context: a heat pump stopped after a freezing night
Our client contacted us after noticing that their GREE central heat pump was no longer blowing hot air. The system, installed approximately five years ago, was functioning properly until a nighttime temperature drop caused the outdoor unit to completely fail .
Upon arriving on site, our technicians Alexandre and Hugo immediately noticed that:
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The condenser fan was no longer spinning.
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No voltage was reaching the compressor.
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The circuit breaker had not tripped, which ruled out a direct short circuit.
These observations pointed the diagnosis towards a problem with the starter relay or electronic card .
Diagnosis: Control board damaged by winter humidity
After opening the outdoor condenser control panel, we found traces of oxidation on the main board. This phenomenon is common in Quebec, where freeze-thaw cycles can cause condensation to form inside electrical compartments.
Our measurements using the multimeter confirmed:
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Correct power supply (240V) from the electrical panel.
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A missing signal to the compressor at the output of the card.
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Irregular resistance on the main relay.
The diagnosis was clear: the GREE heat pump control board needed to be replaced.
The intervention: replacement and complete calibration of the system
Our team had an original GREE spare board in the truck—a critical asset to avoid any unnecessary delays.
Here are the steps of the repair:
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Complete power outage.
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Safe removal of the damaged card and thorough cleaning of the compartment.
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Installation of the new control board , with application of a dielectric sealant to prevent any future moisture infiltration.
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Checking connections (thermistor, compressor, fan, power supply).
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System restart and automatic calibration of defrost cycles.
The system restarted without error. We then measured a stable compressor current , a hot air flow rate of 34°C , and an efficiency in accordance with the device specifications .
Result: comfort restored and prevention reinforced
Once the repair was completed, the customer immediately felt the difference: the flow of warm air was once again circulating in all rooms via the duct system.
We also took the time to explain:
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How to protect the central heat pump in winter , particularly by clearing snow around the condenser.
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The importance of annual preventive maintenance , ideally before the cold season.
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The crucial role of automatic defrosting , often overlooked, but essential to the proper functioning of GREE heat pumps in Quebec.
AirGreen expertise: precision, reliability and local service
Every intervention is an opportunity for us to demonstrate our expertise. Thanks to ongoing training on GREE, Fujitsu, Sharp, Lennox, and Midea products, our technicians are able to quickly diagnose even the most complex faults.
In Boisbriand as elsewhere on the North Shore , we offer:
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Genuine replacement parts to maintain system performance.
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Advanced diagnostic tools (pressure analyzer, thermal camera, communication testers).
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Fast and guaranteed service , even on the coldest days.
Tips for extending the life of a central heat pump
Our experts share some simple tips to avoid this type of breakdown:
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Visually inspect the electrical panel of your outdoor unit at the start of each season.
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Avoid accumulation of ice or leaves around the condenser.
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Schedule a complete annual maintenance , including coil cleaning and checking refrigerant pressures.
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Call a certified professional at the first sign of unusual noise or loss of performance.
In conclusion
This GREE central heat pump repair in Boisbriand perfectly illustrates our team's thoroughness and responsiveness. In just a few hours, we diagnosed, repaired, and restored a system essential to the customer's winter comfort.
At AirGreen , we don't just repair: we preserve the long-term reliability of HVAC equipment throughout the Greater Montreal area — Montreal, Laval, Longueuil, North Shore and South Shore .