When comfort suddenly ends
At AirGreen , our teams operate weekly throughout the greater Montreal area to bring residential HVAC systems back to life. One of our recent service calls took us to Sainte-Dorothée, Laval , where a customer contacted us about a Mitsubishi Electric wall-mounted air conditioner that was no longer producing cold air, despite an active indicator light.
Initial diagnosis: a discreet but serious problem
Upon our arrival, the owner explained that his unit was working perfectly until a slight “clicking” noise appeared, followed by a complete loss of cooling.
Our certified technicians began with a complete inspection of the interior module :
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Checking the air filter and heat exchanger.
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Observe the fan motor for possible mechanical blockage.
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Communication test between the indoor unit and the outdoor condenser .
We quickly noticed that the swing flap was no longer opening and that the airflow remained blocked . Upon further investigation, the analysis revealed a faulty control board , preventing communication with the external compressor.
Intervention: precision and efficiency
Our specialists have carried out:
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Safe disconnection of the system .
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Replacement of the electronic card with an original Mitsubishi Electric part.
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Complete reset of the control circuit .
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Calibration of the interior temperature sensor , often neglected during partial repairs.
After reinstallation, we performed a full performance test . In less than fifteen minutes, the air conditioner was back in action: a steady, quiet, cool airflow .
Prevention and maintenance advice
We took advantage of the intervention to remind the client of some essential points:
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Clean the filters at least once a month during the summer season.
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Avoid turning off the power directly at the circuit breaker, which can disrupt the memory of the electronic card.
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Schedule annual maintenance to check refrigerant pressure and coil cleanliness.
At AirGreen, we make it a point of honor to extend the life of Mitsubishi Electric systems, renowned for their reliability, provided they are rigorously maintained.
Comfort rediscovered in Sainte-Dorothée
At the end of the service, our client found an optimal indoor climate, just in time for a period of intense heat in Laval . His satisfaction reflects our mission: to provide fast, transparent and sustainable service to every home on the North Shore .
Whether for a repair , an installation or preventive maintenance , AirGreen remains your trusted partner in Montreal , Laval , Longueuil , as well as on the North Shore and the South Shore .
Problem encountered: defective electronic card on Mitsubishi Electric wall-mounted air conditioner.
Solution: Board replacement, sensor calibration and full performance test.
Result: immediate return of comfort and optimal cooling.