Winters in Montréal can put HVAC systems to the test—especially when they’re essential for a household’s daily comfort. In Anjou, a customer recently contacted us for an urgent repair of a Polarbear wall-mounted heat pump, following a malfunction detected in the middle of February, with snow still covering the balcony of their home. At AirGreen, we put our expertise to work to diagnose, repair, and optimize this essential unit.
Service Call Context: a Wall-Mounted Heat Pump That Stopped Responding
The customer, living in a condo in Anjou, called us after noticing that their Polarbear wall-mounted heat pump was no longer producing heat, despite correct settings on the remote control. The indoor temperature had dropped below 18 °C, and there was no warm air coming out, even in high-power mode. A prompt intervention was necessary to avoid worsening the issue or further discomfort in the home.
The equipment in question was installed above a sliding patio door, exposed to significant temperature variations due to its location in the kitchen-dining area, a high-traffic space.
Step 1: Visual Inspection and Initial Checks
Our certified technicians first carried out a complete inspection of the indoor unit. The air filter was relatively clean, but a light layer of frost had built up on the coil fins, which is unusual for a well-maintained unit. The error light was flashing in sequences of three, which generally indicates a communication issue between modules or a faulty sensor.
After checking the electrical connections, circuit breakers, and thermostat settings, we opened the wall unit panel to carry out a more in-depth diagnosis.
Step 2: Precise Diagnosis of the Issue
By analyzing the behavior of the electronic control board, we identified a fault in the ambient temperature sensor (thermistor). This small component, crucial for temperature regulation, was sending incorrect data to the control board, causing the compressor to shut down for safety reasons.
We also noticed a buildup of greasy residue and dust on the indoor coil, which significantly reduced heating performance. This situation is common when annual maintenance is skipped or not done thoroughly.
Step 3: Repair and Deep Cleaning
Once the diagnosis was confirmed, we replaced the faulty temperature sensor with a genuine Polarbear part. This step required safe disconnection of the unit and careful handling of the electronic components.
We then carried out a full cleaning of the indoor coil, using a gentle cleaning product suitable for HVAC components and compressed air to dislodge fine particles stuck between the fins.
Finally, we performed a complete system reboot, testing all functions: heating mode, fan operation, automatic defrost, variable speed. Everything worked flawlessly.
Step 4: Maintenance Tips for the Customer
Our technicians took the time to educate the customer on best practices to extend the life of their heat pump:
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Clean the filters every 4 to 6 weeks.
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Avoid turning the thermostat down too much at night.
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Schedule annual maintenance with AirGreen.
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Keep the outdoor unit free of snow, ice, or any obstruction (a crucial detail we verified on-site).
A Reassured Customer and a Fully Functioning Unit
Thanks to this fast and thorough intervention, the Polarbear wall-mounted heat pump regained full efficiency. The customer immediately noticed restored thermal comfort in their main living space, and the unit is once again running quietly, with no vibrations or random shut-offs.
This type of service call demonstrates our expertise in wall-mounted heat pump repair in Montréal, particularly in residential neighborhoods like Anjou. Our customers know they can count on us for efficient, safe, and long-lasting HVAC repairs, regardless of the brand or system complexity.
Why Choose AirGreen for Your HVAC Repairs in Anjou?
At AirGreen, we combine:
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In-depth knowledge of common brands like Polarbear, Gree, Fujitsu, Haxxair, and many more.
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Certified technicians, constantly trained on the latest technologies.
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Fast service, often same-day or next-day.
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Genuine parts, ensuring perfect compatibility.
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Honest advice, focused on long-term performance.
Our mission is simple: to offer every client in Montréal, Laval, Longueuil, Rive-Nord, and Rive-Sud flawless, fast, and professional service, tailored to their needs.
Mistakes to Avoid to Prevent Damaging Your Wall-Mounted Heat Pump
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Never cover the outdoor unit, even in winter.
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Avoid prolonged use in fan-only mode if indoor temperature is too low.
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Never attempt electrical repairs without professional help.
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Don’t ignore blinking lights—they often signal the beginning of a breakdown.
Repair or Replace? Our Tailored Recommendations
In the case of the Anjou customer, repairing the Polarbear heat pump was the best solution: the unit was still fairly new (under 7 years old), and the repair cost was well below that of a full replacement. However, we also offer replacement options with LogisVert grants, when applicable.