When a sudden breakdown threatens the comfort of a family home
At AirGreen , we know how disruptive a central heat pump breakdown can be to the comfort of a home, especially during hot weather. Our team was recently called to Sainte-Julie , on the South Shore of Montreal , to work on a Lennox unit showing worrying signs: no ventilation, abnormal noise, and a system that had completely shut down .
On-site diagnosis: a damaged outdoor fan
Upon our arrival, our technician carried out a complete inspection of the outdoor condenser . One of the first findings was obvious: a broken fan blade , causing significant mechanical imbalance . This type of damage, often caused by an external shock or a foreign object, quickly causes vibrations and can damage the fan motor or even the control board .
Our measuring instruments revealed:
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A correct supply voltage , confirming that the main board was receiving power.
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Unstable amperage on the fan motor, a sign of a tired winding .
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No apparent leaks in the refrigeration circuit, which allowed us to rule out a refrigerant problem.
Repair steps: precision and safety above all
Once the diagnosis was confirmed, we proceeded methodically:
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Complete shutdown of the system's power supply to secure the area.
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Removing the faulty fan , carefully fixed it on the motor shaft.
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Motor inspection : slight axial play noted, requiring replacement to avoid future overloading.
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Installation of a new, perfectly balanced, original Lennox motor and blade .
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Manual rotation test and vibration check before powering up again.
After reassembly, we reset the electronic board and took a full reading of the pressures and temperatures to confirm that the compressor was operating within its nominal ranges .
Result: performance restored and comfort restored
At the end of the intervention, the heat pump restarted without any anomaly.
Noise levels returned to normal, air circulation was optimal, and the interior temperature stabilized within an hour.
The client immediately felt the difference: a house that was fresh, quiet and comfortable again.
Why this type of damage must be treated quickly
A damaged fan on a central heat pump outdoor unit should never be ignored.
This imbalance can lead to:
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Premature engine wear .
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Compressor overheating due to lack of heat dissipation.
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Increased electricity consumption .
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Risk of control board breakage due to mechanical overvoltage.
At AirGreen, we recommend having your Lennox or other brand systems (Midea, Trane, Fujitsu, Gree, etc.) inspected annually to detect this type of anomaly before it becomes critical.
AirGreen expertise: much more than just a repair
Our certified technicians don't just replace parts: they analyze the root cause of the problem.
In this specific case, the blade had probably suffered an impact during the cold season , causing a micro-crack invisible to the naked eye.
Through a thorough inspection and accurate electrical diagnosis , we were able to restore full system performance while preventing a more costly long-term failure .
Conclusion: a Lennox heat pump like new in Sainte-Julie
This intervention perfectly illustrates our approach: technical rigor, speed of action and lasting reliability .
Sainte-Julie residents can once again enjoy their comfort, knowing that their HVAC system is operating at full efficiency, supported by AirGreen's expertise .
AirGreen — HVAC repair and maintenance specialists in Montreal, Laval, Longueuil, North Shore and South Shore.
We work on all brands of heat pumps and air conditioners, with precise diagnostics and guaranteed repairs.