When a slight noise reveals an imminent breakdown
At AirGreen , we know that a simple, unusual noise can be a warning sign of a more serious problem. This is exactly what happened during our recent intervention in Outremont , where a caring customer called us after noticing a metallic grinding noise coming from their Goodman outdoor unit. This discreet, but repetitive noise appeared every time the wall-mounted heat pump started its heating cycle.
The context of the intervention
The system in question, installed on a brick wall typical of Outremont residential buildings, was a Goodman 12,000 BTU model used for both heating and cooling. The unit was still working, but the client feared the noise might signal a complete breakdown.
Our technicians arrived the next morning to carry out a complete on-site diagnosis , first carrying out a visual inspection of the outdoor unit, mounted on a wall bracket.
Diagnosis: A misaligned fan and a worn bearing
After removing the protective grille and observing the fan rotation, our team quickly identified the cause of the noise:
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The exterior fan impeller was lightly touching the metal grille due to motor misalignment .
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The engine bearing also exhibited slight axial play, creating audible friction at each start.
These two anomalies, although minor in appearance, could lead to premature wear of the engine and excessive electrical consumption if they were not corrected quickly.
Steps of repair
Our technicians proceeded according to a rigorous methodology:
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Power off to secure the workstation.
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Complete disassembly of the engine housing and inspection of the fan blades.
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Replacement of the motor ball bearing with a certified original Goodman model.
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Readjustment of the engine mount , followed by precise realignment of the propeller.
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Complete cleaning of the condenser , removing dust and debris that could obstruct airflow.
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Complete electrical test (checking operating current and starting capacitor).
Once everything was reassembled, the unit restarted in perfect silence , regaining optimal thermal performance.
The Importance of Proper Mechanical Alignment
A slightly misaligned fan may seem trivial, but its cumulative effects are often costly:
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Vibrations transmitted to the compressor;
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Accelerated wear of the engine bearing;
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Decreased heat transfer efficiency;
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Risk of long-term refrigerant leakage.
By correcting these points, we prevented a major failure while optimizing the durability of the system.
Preventive maintenance tips
We advised the client to follow a few simple steps to avoid future problems:
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Visually inspect the unit each season for abnormal noise.
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Ensure that no leaves or debris obstruct the grilles.
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Schedule an annual AirGreen maintenance visit , especially before winter.
These actions help maintain the system's energy performance and reduce operating costs.
AirGreen: precise and preventive interventions
Our team of HVAC repair experts operates daily throughout Montreal, Laval, Longueuil, the North Shore, and the South Shore . We always favor a preventative and sustainable approach, aimed at extending the useful life of systems rather than simply resolving an immediate breakdown.
At AirGreen, every suspicious noise, every vibration, every drop in performance is an opportunity to take action before a minor problem becomes a costly emergency. And it's this philosophy that has built our reputation.