When comfort and design meet: an HVAC repair by AirGreen
At AirGreen , we were recently called in for a Midea wall-mounted air conditioner repair in a charming apartment in the Rosemont–La Petite-Patrie neighborhood of Montreal . The client had just renovated their interior, featuring a stunning pink arched accent wall , but their air conditioning system refused to work properly. The unit displayed an error code and a temperature stuck at 30°C , making the environment uncomfortable in the summer heat.
Diagnosis: a well-hidden electronic problem
Upon arrival, we conducted a thorough inspection of the Midea wall unit , a 12,000 BTU inverter model. At first glance, the front panel was removed and the side covers were off—a typical situation when a customer has attempted dusting or restarting without success.
Our diagnostic steps:
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Checking the main circuit board : the indicator light was flashing irregularly, indicating a communication fault between the PCB board and the temperature sensor .
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Voltage measurement : We confirmed a stable 240V power supply, excluding an external electrical problem.
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Inspected the sensor and connections : a slightly corroded wire was responsible for an incorrect temperature reading.
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Cleaning the evaporator coil : although in good condition, it had a thin layer of dust slightly limiting heat exchange.
Repair carried out: AirGreen precision and reliability
We replaced the room temperature sensor with a genuine, latest-generation Midea part. A system calibration test then confirmed the system was back to normal. The unit's digital display returned to a stable and accurate reading, displaying the actual room temperature.
Main interventions:
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Replacing the temperature sensor (thermistor)
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Complete internal cleaning of the evaporator
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PCB board readjustment and signal check
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Final test in cooling and dehumidification mode
Result: comfort restored and aesthetics preserved
The customer immediately noticed the difference: the air conditioner blew consistent, quiet, cool air. We neatly reinstalled the front panels and side covers, leaving the unit as pristine as the carefully painted wall surrounding it.
This intervention perfectly demonstrates the AirGreen philosophy: combining technical performance, cleanliness of work and respect for the client's space . In a well-designed and neat environment like this, every detail counts - right down to the position of the drainage wire and the recalibration of the airflow.
AirGreen Tips to Extend the Life of Your Wall-Mounted Air Conditioner
To avoid this type of breakdown, we recommend:
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Complete annual maintenance (cleaning of coils, electrical check, calibration of sensors).
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Avoid handling the unit without unplugging the power.
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Maintain clean air filtration to protect electronic components.
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Call a Midea certified technician for any display anomalies.
Why choose AirGreen for your HVAC repairs in Montreal
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Certified and trained technicians on Midea, Fujitsu, Gree, Sharp systems, and more.
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Fast and careful service covering Montreal, Laval, Longueuil, the North Shore and the South Shore.
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Original parts and precise diagnostics thanks to our specialized tools.
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Human and transparent approach , with clear explanations on each intervention.
A Midea air conditioner ready for a new summer
At the end of our intervention, the client not only regained thermal comfort , but also peace of mind . His Midea wall-mounted air conditioner is now operating at full capacity, ready to ensure cool summers and temperate winters—all while blending perfectly into his harmonious interior.
At AirGreen, we don't just repair: we bring your HVAC systems back to life.
A service that is technical, aesthetic and human , true to the reputation for excellence that we cultivate every day in Greater Montreal.
📞 Need fast and professional service?
Contact AirGreen Climatisation & Chauffage today for your residential and commercial HVAC repair, maintenance or installation needs in Montreal, Laval, Longueuil, on the North Shore and the South Shore.