Quick intervention for a noisy wall-mounted heat pump
At AirGreen , we were recently called to Beaconsfield , in the West Island of Montreal, to diagnose an unusual noise problem on a Panasonic wall-mounted heat pump . The customer, a single-family homeowner, had noticed that the indoor unit was emitting an intermittent roaring sound accompanied by a slight irregular hiss , especially when starting the heating cycle.
This type of symptom is common on wall-mounted units installed for more than five years without comprehensive preventative maintenance. Panasonic heat pumps, renowned for their reliability, can accumulate dust on the fan blades and in the internal ducts, causing mechanical imbalance and audible vibrations.
Inspection and in-depth diagnosis
Upon our arrival, our RBQ certified technician carried out a systematic analysis of the HVAC system :
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Airflow test : The flow rate was reduced by approximately 30% compared to factory specifications.
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Visual inspection of the tangential fan : accumulation of dirt and slight deformation of a blade.
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Blower motor check : electrical resistance within normal tolerances, but bearing friction noise present.
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Refrigeration pressure measurement : compliant, indicating that no refrigerant leaks were present.
The diagnosis was clear: the unbalanced indoor fan was causing the vibrations and noise, amplified by the slightly loose wall bracket.
Steps of repair
Our team undertook a complete repair on site , following AirGreen protocols:
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Removing the front cover and air filter to access the fan assembly.
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Thorough cleaning of fins and ducts using a specialist biodegradable cleaner.
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Rebalancing the tangential rotor using a portable calibration device.
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Lubricate the motor bearings with a heat-resistant silicone-based lubricant.
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Tightening of the wall bracket and anti-vibration isolation to eliminate any resonance with the wall.
Once the heat pump was reassembled and tested, operation became perfectly silent again. The noise level measured during blowing went from 46 dB to 28 dB , a return to original performance.
Preventive maintenance and AirGreen recommendations
In order to avoid this type of problem from recurring, we recommended to the customer:
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Have the filters cleaned every 4 weeks during heavy use seasons.
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Schedule annual professional maintenance , including fan cleaning and pressure checks.
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Avoid placing plants or decorative objects too close to the unit, which can restrict airflow.
We also took the opportunity to check the condensate drain , an often neglected point, and remove a slight deposit of dust that could cause an overflow in the long term.
Result: comfort and silence restored
After the repair, the Panasonic wall-mounted heat pump returned to optimal operation:
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Indoor temperature stabilized at 22°C in heating mode .
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Uniform airflow throughout the living room.
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Complete disappearance of noise and vibrations.
The customer particularly appreciated the speed of the intervention and the precision of the diagnosis. At AirGreen , each service call is treated with the same rigor: analysis, lasting repair, and personalized support .
Our technicians operate throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore , guaranteeing professional, reliable HVAC service that complies with the standards of the Régie du bâtiment du Québec (RBQ) .