A technical intervention in the middle of the Laval winter
On a freezing February morning in Sainte-Dorothée (Laval) , our AirGreen team was urgently called to diagnose a Kanion wall-mounted heat pump that was no longer heating. Temperatures were around -15°C, and the client, a duplex owner, relied entirely on this system for winter comfort.
Our mission: to identify the cause of the loss of heating performance and quickly restore the system to operation, despite extreme weather conditions.
Initial diagnosis: abnormal pressure and loss of refrigerant
Upon arrival, we carried out the standard checks:
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Outdoor condenser inspection: no visible obstruction, but abnormal frost present on the base of the unit .
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Checking the pressure gauge: refrigerant pressure below nominal values .
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Measurement of inlet and outlet temperatures: small difference, confirming a loss of thermal efficiency .
These clues pointed us towards a refrigerant leak , a common problem on Kanion systems after several freeze-thaw cycles.
Steps of repair
1. Locating and repairing the leak
Using an electronic leak detector , we identified seepage at the liquid side flare connection .
We have :
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Tighten the flare with a calibrated torque wrench.
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Cleaned the area and applied a detection solution to confirm the seal.
2. Complete draining and vacuuming
Once the leak is repaired, we have:
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Recovered the remaining refrigerant in a certified cylinder (visible in the photo, placed on an electronic scale).
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Performed a deep vacuum for 30 minutes to remove all moisture and impurities from the circuit.
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Checked vacuum stability for 10 minutes to ensure no new leaks.
3. Refrigerant recharge
We then recharged the heat pump with R410A refrigerant according to the manufacturer Kanion's specifications, using the weight method with accuracy to the nearest gram.
The system was restarted under observation:
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Pressure in accordance with standards.
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Blowing temperature at 42°C at the interior outlet.
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Automatic defrosting in operation.
Result: comfort restored and efficiency regained
After being put back into service, the Kanion heat pump has regained its full performance.
The customer immediately noticed a rapid rise in interior temperature and increased stability of the heating , even during defrost cycles.
We recommended:
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A complete spring maintenance , including cleaning of the indoor evaporator and outdoor condenser.
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A biannual pressure check , to prevent any gradual loss of refrigerant.
AirGreen expertise: guaranteed performance even below zero
At AirGreen, we understand the demands of HVAC systems in the Quebec climate . A heat pump must be able to perform flawlessly, even in extreme cold.
Our certified technicians:
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Accurately diagnose refrigerant leaks,
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Carry out repairs that comply with environmental standards,
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And guarantee exact refilling according to the technical sheet of each brand — whether it is Kanion, Midea, Fujitsu, Gree or Sharp .
To remember
A refrigerant leak , even a small one, can cause:
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A significant loss of heating power ,
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Compressor overload ,
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And, ultimately, a complete system failure .
Acting quickly, as in this case in Sainte-Dorothée, not only helps avoid a costly breakdown, but also preserves the life of the compressor .
Conclusion
This Kanion wall-mounted heat pump repair in Laval perfectly illustrates our approach: technical rigor, respect for procedures, and concern for customer comfort .
In the dead of winter, every degree counts—and at AirGreen, we make sure every HVAC system delivers its full performance, no matter the outside temperature.