A sudden breakdown in the middle of a winter thaw
At AirGreen , we regularly receive calls for wall-mounted heat pump failures when temperatures fluctuate suddenly. This is exactly what happened in Town of Mount Royal , where a Lennox wall-mounted unit installed on the rear facade of a red brick house stopped heating properly after a freezing night followed by a quick thaw.
The customer, accustomed to constant comfort, noticed that the heat pump was blowing warm air instead of hot air, and that a metallic noise was heard when the compressor started.
Complete inspection and diagnosis
Our certified technicians arrived on site the next morning. After a brief discussion with the owner, we began a four-step diagnostic :
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Check electrical circuit – stable voltage, no tripped circuit breakers.
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Compressor observation – it started, but vibrated abnormally.
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Refrigerant pressure test – lower than normal pressure, suggesting a microleak in the system.
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Visual inspection – slight trace of oil around a flair connection, confirming a loss of refrigerant gas.
The problem was clear: a leak in the discharge line was reducing compressor performance and preventing the system from producing the required heat.
On-site repair: welding, recharging and calibration
Once the leak was identified, our team proceeded methodically:
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Purging the circuit and recovering the remaining fluid using our mobile station.
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Cleaning and re-welding of the flair connection , replaced by a copper brazed connection for optimal sealing.
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Nitrogen leak test to confirm repair.
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Recharge the system with R-410A refrigerant , according to Lennox specifications.
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Complete restart and measurement of evaporation and condensation temperatures.
After about 90 minutes, the Lennox heat pump was working perfectly again. The vibrations had disappeared and the blowing temperature reached 47°C , a sign of restored efficiency.
Tips for extending the life of a Lennox heat pump
At the end of the intervention, we offered some recommendations to the owner to avoid future breakdowns:
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Have the fittings checked for leaks every two years.
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Clean the fan and outdoor coils regularly.
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Ensure that refrigeration ducts are well insulated and protected against the weather.
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Schedule annual preventative maintenance , especially before periods of extreme cold or heat waves.
A well-maintained heat pump can last more than 15 years while maintaining excellent energy efficiency—a lasting investment for any household in the Montreal area.
AirGreen expertise: precision, transparency and performance
This repair in Ville Mont-Royal perfectly illustrates the AirGreen philosophy :
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Diagnose quickly without unnecessary assumptions.
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Repair sustainably with parts and techniques that comply with manufacturer standards.
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Inform the customer transparently at every stage.
Our team of experts covers Montreal, Laval, Longueuil, the North Shore and the South Shore , offering a complete HVAC service: repair, maintenance and installation of wall-mounted and central heat pumps.
Final result: comfort restored and performance optimized
After our intervention, the Lennox wall-mounted heat pump in Town of Mount Royal was fully efficient again. The client immediately noticed the difference: consistent heat, stable electricity consumption, and quiet operation.
Once again, our mission is accomplished: to restore comfort, extend the life of equipment and strengthen confidence in AirGreen , the HVAC specialist in the greater Montreal area.
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