Expert intervention to bring a tired outdoor unit back to life
At AirGreen , every service call is an opportunity to demonstrate our expertise in HVAC system repair in the greater Montreal area. This time, our team traveled to Sainte-Julie , on the South Shore , to diagnose a Yonan wall-mounted heat pump whose owner was noticing a drop in performance and unusual noises coming from the outdoor unit.
The context: a wall-mounted heat pump in difficulty
The unit, a Yonan outdoor unit attached to a red brick wall, was part of a typical mini-split system installed in a semi-detached house. The customer reported that, for several weeks, the system seemed to be struggling to heat efficiently. Additionally, a metallic scraping noise could be heard each time it was started, and ice was building up around the base of the unit, which worried the owner.
These symptoms pointed us towards a fan problem , a motor failure , or a defrosting issue . A thorough diagnosis was required.
Diagnosis: A tired outdoor fan motor
Upon arrival, our technician performed a complete visual inspection of the Yonan unit. The external fan showed slight wobble, indicating an off-center shaft . Upon removing the front grille, we noticed advanced wear on the motor bearing . This friction not only generated the noise heard by the customer, but also reduced airflow, compromising the efficiency of heat exchange.
We also noticed an abnormal buildup of frost around the base of the unit—a classic indicator of an inadequate defrost cycle . A check of the circuit board confirmed that the defrost control was working, but the fan motor was not running at the speed required to ensure proper heat dissipation.
Repair: Engine replacement and complete maintenance
Once the diagnosis was confirmed, we proceeded to:
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Safely disconnecting the system and checking the refrigerant pressure (R-410A in this case).
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Replacement of the outdoor fan motor , ensuring that the original dimensions and electrical characteristics are maintained.
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Complete cleaning of the protective grid and the propeller .
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Inspection of electrical connections and control relay .
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Checking the defrost cycle after restarting.
After installing the new motor, the Yonan heat pump resumed normal operation. The restored airflow was stable, quiet, and efficient. The customer immediately noticed improved heating performance and the complete elimination of annoying noise.
Technical details and best practices
Intervention specifications:
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Brand: Yonan
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Type: Wall-mounted heat pump (outdoor unit)
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Refrigerant: R-410A
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Main Problem: Worn Fan Motor
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Solution: Replace the motor, check the defrost
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Result: Restored performance and comfort, reduced noise, improved energy efficiency
Our advice to avoid this type of breakdown:
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Clean the condenser fins regularly to allow optimal air circulation.
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Avoid obstructions (snow, leaves, canvas) around the outdoor unit.
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Have the motor and bearings inspected every two years by a qualified technician.
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Schedule annual preventative maintenance at the beginning of each heating season.
Why call AirGreen for your HVAC repairs in Sainte-Julie
Our team is distinguished by:
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Certified technicians specializing in all major brands (Yonan, Gree, Fujitsu, Sharp, Midea, and more).
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A rigorous diagnosis before any intervention.
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Genuine parts and long-lasting repairs .
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Fast service throughout the South Shore , including Sainte-Julie, Brossard, and Saint-Bruno.
At AirGreen , we believe that every repair is an opportunity to extend the life of an appliance and reduce your home's energy footprint. Our approach is based on transparency, reliability, and sustainable performance .
Result: a satisfied customer and a heat pump ready for winter
After our work, the client regained consistent thermal comfort in his home, even on the coldest days. The Yonan heat pump, now perfectly silent and efficient, has regained its original efficiency.
This type of intervention perfectly reflects AirGreen's mission: to guarantee reliable, efficient HVAC systems adapted to the Quebec climate.
AirGreen – Experts in wall-mounted heat pump repair in Montreal, Laval, Longueuil, North Shore and South Shore.