A typical mid-season service call: when a heat pump stops heating
At AirGreen , we often receive calls in the fall, when Montreal's first cold snap sets in and wall-mounted heat pumps start operating in heating mode again after a long period of summer inactivity. This is exactly what happened in Côte-des-Neiges , where a customer contacted us after noticing that their Daikin heat pump was no longer producing hot air, despite a normal display on the remote control.
On-site diagnosis: a typical problem, but one to be taken seriously
Our technician quickly arrived on site. The outdoor condenser, installed on a small condo balcony, was clean and well-maintained, but we noticed one important detail: no condensation or compressor noise when it was turned on. This indicated a refrigeration circuit failure or a protection device that was triggered .
Initial checks confirmed:
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Stable supply voltage at 240V.
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Communication between indoor and outdoor units functional.
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No error codes on the screen.
After opening the service panel, further inspection revealed intermittent compressor start-up , accompanied by a slight clicking noise—a classic sign of a weakened start capacitor .
Capacitor replacement and refrigeration cycle check
We replaced the faulty capacitor with an equivalent genuine Daikin part and restarted the system. After a few minutes, the compressor started correctly, the suction pressure returned to normal range and the unit began blowing stable warm air at 42°C.
To ensure long-term reliability, we also have:
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Checked the R-410A refrigerant level (no leaks detected).
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Cleaned the coils with a biodegradable product.
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Tested the thermal probes and automatic defrosting.
Result: restored comfort and optimal efficiency
A few minutes after the repair, the condo's interior temperature returned to 22°C, and the client noticed the heat pump operating smoothly and quietly . A quick and precise response, typical of our approach at AirGreen.
Maintenance tips for wall-mounted heat pumps in urban areas
In environments like Côte-des-Neiges or Ville-Marie , outdoor units installed on narrow balconies or corrugated iron walls are often exposed to micro-urban debris , fine dust and significant temperature variations.
To prevent breakdowns:
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Clean the interior filters every month during the heating season.
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Make sure the water drains are clear.
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Schedule an annual inspection by a certified technician.
Why choose AirGreen for your HVAC repairs in Montreal
At AirGreen, we understand the reality of Montreal's climate and the specifics of installing in condos, duplexes, or single-family homes. Our technicians:
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Quickly diagnose faults on Daikin, Gree, Fujitsu, Midea, Lennox, and more.
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Use certified parts to maintain the manufacturer's warranty.
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Ensure that each system is calibrated to provide the best possible energy efficiency , winter and summer.
Fast, reliable and transparent service
The Côte-des-Neiges customer particularly appreciated our same-day availability and cost transparency . The replaced part was demonstrated on-site, and a detailed report was provided. As with all our repairs, we offered a 12-month warranty on both labor and the replaced part.
In summary
A simple capacitor failure could have resulted in an unnecessary complete heat pump replacement. Thanks to an accurate and honest diagnosis , we got a unit back up and running that was still in excellent condition. This is what AirGreen is known for throughout Montreal, Laval, the North Shore, and the South Shore : fast, professional, and long-lasting HVAC repair service.