A service call in the middle of winter in Sainte-Rose
When a customer in Sainte-Rose, Laval , contacted us in February about a problem with their Trane central heat pump , the situation was urgent. In the midst of a severe cold spell, their system was no longer providing adequate heat, and the outdoor unit was displaying an impressive layer of ice on top. At AirGreen , we know this is a common scenario when defrost cycles are disrupted—a typical phenomenon in Quebec winters.
Initial diagnosis on the ground
Upon arrival, we found a high-end Trane outdoor unit installed against a brick wall typical of Laval residences. The unit, partially covered in snow, showed abnormal ice buildup on the upper part and was experiencing reduced performance.
Our technicians carried out a complete analysis of the defrost cycle and checked the refrigerant circuit pressures . The verdict: a defective defrost sensor , unable to send the correct signals to the electronic board, which prevented the system from switching to defrost mode when necessary.
Intervention and replacement of parts
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Safe disconnection of the unit via the external circuit breaker.
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Disassembly of the control panel and inspection of the Trane control board.
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Replacement of the defrost sensor with a compatible genuine Trane part.
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Complete cleaning of the unit: steam defrosting, removal of accumulated snow and inspection of the upper fan.
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Restart with automatic defrost cycle monitoring.
Once the repair was complete, the heat pump resumed normal operation, efficiently alternating between heating and defrosting. The indoor temperature quickly stabilized, and the customer was able to enjoy renewed comfort, even at -20°C.
AirGreen Expertise: Prevention is better than cure
At AirGreen , we always emphasize the importance of preventative maintenance for HVAC systems. In this case, an annual inspection before winter would have helped detect the sensor failure before it caused a loss of performance.
We recommend that all our customers visually check their outdoor unit after each snowfall:
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Clear the top and sides of the unit.
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Avoid any obstruction to ventilation.
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Monitor for persistent ice.
A robust Trane heat pump, but sensitive to maintenance
Trane models are renowned for their durability and superior energy efficiency. However, like any complex system, they require rigorous maintenance and professional monitoring .
Our certified technicians have a perfect command of the brand's electronic circuits and refrigeration components , whether they are central, wall-mounted, or multi-zone heat pumps.
The result: restored performance, guaranteed comfort
After our interventions:
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The defrost cycle automatically restarted at the correct frequency.
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The refrigerant pressure has been recalibrated.
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Energy efficiency has returned to its original levels.
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The satisfied customer opted for an annual AirGreen maintenance plan , guaranteeing complete monitoring every fall.
Why choose AirGreen for your HVAC repairs in Laval and elsewhere?
We operate throughout Greater Montreal: Montreal, Laval, Longueuil, the North Shore and the South Shore . Our reputation is based on:
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Qualified technicians specializing in Trane, Lennox, Goodman, Midea, Fujitsu, Gree, and many other systems.
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Original parts for every brand.
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Rapid intervention and accurate diagnosis .
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Sustainable solutions , not temporary fixes.
In conclusion
This Trane heat pump repair in Sainte-Rose perfectly illustrates AirGreen's rigor and expertise: in-depth diagnostics, rapid replacement of critical components, and complete restoration of home comfort. In both winter and summer, our teams ensure that each home maintains a stable temperature and an efficient HVAC system.