In the harsh reality of Québec winters, a heating system failure can quickly become critical. At AirGreen, we’re often called in for emergency repairs on wall-mounted heat pumps that stop working under extreme weather conditions. This article highlights a technical service call in Lorraine, just north of Montréal, involving a Koolking wall-mounted heat pump installed outdoors, where the unit was partially blocked by snow and poorly protected from the elements.
Background of the Service Call in Lorraine
The customer contacted us early one February morning, reporting that their Koolking wall-mounted heat pump was no longer heating the home properly. The outdoor unit appeared to be running intermittently and was no longer responding properly to the indoor control. With the temperature sitting at -18°C at the time of the call, a quick response was essential to restore indoor comfort.
Initial Visual Diagnosis: Snow Buildup and Poor Ventilation
Upon arrival at the Lorraine address, our team quickly identified several problematic factors:
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The Koolking outdoor unit was installed beneath a metal staircase, partially sheltered but tightly squeezed between a wall, a storage bin, and a temporary shelter.
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A significant buildup of snow and ice had formed around the base of the unit.
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The fan of the outdoor unit appeared to be partially blocked by a thin layer of ice, greatly reducing airflow.
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The tight space severely limited proper airflow, which is critical for the system to function efficiently in heating mode.
Steps Taken by AirGreen’s Technicians to Repair the System
1. Securing and Fully Clearing Snow from the Unit
Our first task was to manually remove all accumulated snow, both around and beneath the unit. We also carefully melted the ice buildup, making sure not to damage the coil fins. This step helped restore a clear and open area around the unit.
2. Technical Inspection and Electrical Check
We then performed a complete check of the electrical system and temperature sensors. Our findings:
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No major electrical faults were detected.
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The outdoor temperature sensor had likely been affected by the snow buildup, causing errors in the automatic defrost cycle.
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The automatic defrost mode was not activating correctly, which had led to frost buildup on the outdoor coil.
3. System Pressure and Performance Testing
Using our diagnostic tools, we checked:
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Refrigerant pressure (R410A), which was within manufacturer specifications.
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The compressor discharge temperature.
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The fan speed, which was back to normal once cleared.
No refrigerant leak was detected, confirming that the system itself was generally in good condition, despite the harsh conditions.
Recommendations Provided to the Client
After restoring the Koolking heat pump and confirming that it was operating normally, we shared several key recommendations with the client:
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Install a protective aluminum winter cover to prevent further snow and ice buildup in the tight installation space.
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Slightly reposition the outdoor unit if possible, to improve airflow—especially critical during heavy snowfall.
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Schedule a preventive maintenance appointment in the fall, which includes a full cleaning of the outdoor unit and a thorough sensor check.
Results: Restored Performance and a Satisfied Customer
Once the work was completed, we tested the Koolking unit for over 30 minutes to ensure proper operation:
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The indoor temperature quickly rose to 21°C.
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The defrost cycle automatically activated after 28 minutes, indicating that the sensors were working properly again.
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The customer expressed great relief, happy that the issue was resolved without the need for costly part replacements.
Why This Type of Service Is Critical in Lorraine and the North Shore
Regions like Lorraine, exposed to long and harsh winters, require extra vigilance when it comes to wall-mounted heat pump repairs. Even something as simple as poor airflow or snow accumulation can lead to major failures. At AirGreen, we specialize in the maintenance, repair, and optimization of wall-mounted heat pumps from all major brands, including Koolking, Gree, Fujitsu, Tosot, and more.
We understand that every service call is unique. That’s why we take the time to thoroughly assess every situation, and to offer tailored solutions that match both the client’s needs and the configuration of the installation.
AirGreen’s Expertise in Wall-Mounted Heat Pump Repairs Across Greater Montréal
Fast and Professional Service on the North Shore
Our mobile teams are ready to respond quickly in Lorraine, Blainville, Bois-des-Filion, Laval, Terrebonne, and throughout Montréal’s North Shore.
Winter Maintenance: A Smart Seasonal Habit
We strongly recommend that all of our clients schedule a heat pump inspection in the fall, to avoid unexpected breakdowns in the heart of winter. Preventive maintenance is almost always cheaper than emergency repairs.
Replacement Parts Available for Koolking Units
AirGreen keeps a strategic inventory of replacement parts compatible with Koolking wall-mounted heat pumps, including:
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Outdoor temperature sensors
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Replacement fans
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Electronic control boards
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Defrost relays
This allows us to perform efficient repairs even in more complex technical cases.
Conclusion: AirGreen, Your Trusted HVAC Partner in Lorraine
This service call in Lorraine perfectly illustrates our rigorous, professional, and customer-focused approach. With a recognized expertise in HVAC system repairs, we’re able to quickly restore comfort to your home, even during the harshest cold snaps. If you notice that your Koolking heat pump—or any other brand—is underperforming during the winter, don’t wait: contact AirGreen at the first sign of trouble.
