Rapid intervention on a failed Carrier system
On a beautiful afternoon in Outremont , our AirGreen team was called regarding a problem with a Carrier wall-mounted heat pump , installed on the brick facade of a typical duplex in the area. The customer contacted us after noticing that his unit was no longer producing cold, despite the normal operating noise of the outdoor fan. This type of situation—fan active but no cooling—is often a sign of a problem with the compressor or refrigeration circuit .
Initial inspection and diagnosis
Upon arrival, we performed a visual inspection of the outdoor unit. The unit, securely fastened to the wall, showed a slight accumulation of dust and debris on the condenser fins. No obvious signs of leakage were visible. We then connected our pressure gauges to measure operating pressures and noted a significant anomaly: abnormally low low pressure , indicating a refrigerant leak .
The customer, who uses his Carrier system for both heating and cooling, mentioned that heating performance during the winter had also been reduced, confirming a gradual loss of refrigerant over the months.
Steps of the repair carried out by AirGreen
After locating the leak—a micro-crack on the flare fitting of the liquid tube —we proceeded with the following steps:
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Safe recovery of residual refrigerant , to avoid any emissions into the environment.
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Disassembly and complete cleaning of the flare fitting before welding.
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High temperature brazing to ensure a lasting seal.
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Complete vacuuming of the installation to -500 microns to eliminate all humidity.
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Accurate recharge with R-410A refrigerant , according to Carrier manufacturer specifications.
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Performance test on both modes (heating and air conditioning) to confirm pressure stability and cold return.
Results: efficiency and comfort restored
After recharging, the Carrier wall-mounted heat pump immediately resumed optimal operation. Pressures were balanced, airflow was cool and consistent, and the indoor temperature quickly returned to a comfortable level. The customer was particularly impressed by the speed of the response and the accuracy of the diagnosis.
We also took advantage of our visit to recommend:
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Annual cleaning of the outdoor coils.
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An inspection of electrical connections and flare joints at the start of each season.
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Installing a winter unit cover to protect the unit from weather and ice.
Why choose AirGreen for your HVAC repairs in Montreal
At AirGreen , we understand how disruptive a heat pump breakdown can be to your daily comfort. That's why our certified technicians respond quickly throughout Montreal, Laval, Longueuil, the North Shore, and the South Shore , using modern diagnostic tools and genuine parts. We repair all major brands—Carrier, Gree, Fujitsu, Midea, Sharp, Goodman, Trane, and many more.
Our approach is simple: accurate diagnosis, lasting repair, transparent service . Each intervention is documented, tested, and accompanied by personalized preventive advice.
Conclusion: a heat pump ready for all seasons
Thanks to this repair, our client's Carrier wall-mounted heat pump in Outremont is ready to withstand both summer heat and harsh winters. By restoring the system's energy efficiency, we've helped the home regain optimal indoor comfort while reducing electricity consumption.