In the peaceful residential neighbourhood of Montréal-Ouest, our AirGreen team was recently called for a HVAC service call involving a Koolking wall-mounted heat pump. While this service may have seemed routine at first, it turned out to be a perfect example of our technical expertise, swift execution, and personalized approach to systems that can sometimes be temperamental.
Signs of a struggling unit: the customer's call
Our customer, owner of a bright and well-maintained home in Montréal-Ouest, contacted us one March morning. Her Koolking wall-mounted heat pump, installed just above a large window in the living room, was no longer blowing hot or cold air despite correct settings on the remote. The digital display stayed on, but no air was coming out of the motorized louvers.
She had tried restarting the unit, checked the batteries in the remote, and even cut the power at the breaker for a few minutes—all without success. It was clear that a professional wall-mounted heat pump repair was needed.
Complete inspection of the Koolking heat pump: on-site diagnosis
Upon arrival, our certified technician conducted a visual and functional inspection of the indoor unit. Here’s what we analyzed first:
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Digital display was active, indicating stable power supply.
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No sound from the indoor fan when powered on, even after multiple attempts.
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Suspected start capacitor, slightly bulging and visible after opening the front panel.
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Verified the condition of internal electrical connections, which were clean and secure.
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Error code E5 briefly appeared after rebooting the unit, pointing to a fan or electronic board issue.
Based on these observations, our diagnosis clearly pointed to a faulty indoor fan motor, possibly accompanied by a worn-out capacitor.
Fast and effective solution: targeted parts replacement
At AirGreen, we know Montréal-Ouest residents rely on their wall-mounted heat pumps all year round. That’s why we keep a stock of compatible parts for a wide range of units, including the Koolking series.
We proceeded with the following steps:
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Removed the indoor fan motor for off-circuit testing.
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Confirmed an internal short circuit in the motor using our specialized multimeter.
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Replaced the motor with a new, Koolking-compatible part.
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Proactively replaced the start capacitor, which was slightly bulging.
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Fully restarted the system after reassembly, tested in both heating and cooling modes.
In under two hours, the unit was once again blowing strong, consistent airflow with temperatures matching the setpoints.
Final result: comfort restored and a reassured customer
Thanks to our intervention, the Koolking wall-mounted heat pump in Montréal-Ouest was back to peak performance, with no unusual noise or temperature fluctuations. Our customer was able to resume her daily routine with peace of mind, enjoying a comfortable indoor climate without the need to replace the entire unit.
We also recommended:
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Annual professional maintenance to maintain optimal heat pump performance.
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Periodic checks of filters and intake grilles.
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The optional installation of a surge protector, to prolong the life of the electronic components.
Why choose AirGreen for your wall-mounted heat pump repairs in Montréal-Ouest?
This type of service call perfectly reflects AirGreen’s approach:
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Accurate and fast diagnostics thanks to our expertise with wall-mounted systems of all brands.
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Replacement parts in stock, reducing wait times.
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Courteous, punctual, and transparent service, with clear explanations at every step.
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In-depth knowledge of Koolking units, commonly found in mid-sized homes across Greater Montréal.
Prevent breakdowns: a few practical tips
To avoid emergency calls like this one, here are our tips for owners of Koolking wall-mounted heat pumps:
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Clean your indoor filters every 4 to 6 weeks.
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Avoid blocking louvers or sensors with curtains or furniture.
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Watch for performance changes (lukewarm air, odd noises, weak airflow).
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Have the system inspected annually by a certified technician.
Montréal-Ouest: a residential sector where HVAC performance is essential
With its well-insulated homes often facing major temperature swings, Montréal-Ouest is a neighbourhood where efficient heating and cooling systems make a real difference. Units like the Koolking wall-mounted heat pump are especially popular here for their compact size, dual heating/cooling functionality, and ability to maintain consistent comfort at low cost.
Our mission at AirGreen is to extend the life of these units through meticulous, reliable, and tailored service.
Call AirGreen for your wall-mounted heat pump repairs in Montréal-Ouest
Have a Koolking or other brand heat pump showing signs of failure? At AirGreen, we respond quickly across Montréal, Laval, Longueuil, the North Shore, and the South Shore for all your HVAC repair needs.
Contact us today for an accurate diagnosis and an efficient repair — our technicians are ready to restore lasting comfort in your home, no matter the season.