A sudden breakdown in the middle of the hot season
At AirGreen , we regularly receive calls from customers whose wall-mounted air conditioning systems are showing signs of weakness after several years of use. This was the case for a resident of Côte-Saint-Luc , on the island of Montreal, who contacted us when he noticed that his Panasonic wall-mounted air conditioner was no longer producing cold air, despite an operating indicator light being on.
Panasonic Wall System Complete Diagnostics
Upon arrival, our team conducted a thorough inspection of the indoor unit. The owner reported a slight vibrating noise followed by a sudden stop of the indoor fan. This type of symptom is often linked to:
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A buildup of dust in the fan compartment.
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A tired evaporator motor .
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Or even a problem with the electronic card preventing the motor from being controlled.
Our technicians began by opening the front hood and removing the air filters to inspect the cross-flow fan. An abnormal resistance to movement was detected—a sign that the motor was overloaded due to dirt and wear.
The intervention: precision and in-depth maintenance
To avoid any future breakdowns, we opted for a complete overhaul of the Panasonic indoor unit :
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Complete cleaning of the evaporator and fan using an HVAC-approved biodegradable product.
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Motor lubrication and start capacitor check.
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Replaced the interior temperature sensor , which was showing fluctuating values.
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Checking communication between the wall unit and the outdoor compressor via the control board.
After these steps, a restart test confirmed the return of a powerful, stable, and perfectly cooled airflow. The vibrating noise had disappeared, and the ambient temperature dropped several degrees in less than 10 minutes.
Tips to extend system life
Our experts took advantage of this visit to advise the client on a few simple but essential actions:
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Clean the filters every four to six weeks during the summer season.
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Avoid turning off the wall system power directly at the panel — this can damage the circuit board.
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Schedule an annual service with an AirGreen certified technician to inspect refrigerant gas pressures and electrical connections.
These precautions help maintain optimal energy efficiency , particularly with Panasonic models, which are renowned for their long-term reliability when properly maintained.
Result: comfort and efficiency restored in Côte-Saint-Luc
By the end of the repair, the wall-mounted air conditioner was back operating at full capacity, providing consistent, quiet cooling . The delighted homeowner was able to regain optimal comfort in his master bedroom—just in time for a week of predicted heatwaves in Montreal .
This service call perfectly illustrates our commitment: to offer each customer an accurate diagnosis , a lasting repair and a stress-free experience . Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , AirGreen is your trusted partner for all your HVAC repair needs.
Problem encountered: Overloaded fan motor and faulty temperature sensor on a Panasonic wall-mounted air conditioner.
Solution: Complete cleaning, lubrication, sensor replacement and electronic check.
Result: restored performance, efficient cooling and quiet operation.