Sudden power outage in the heat: emergency call to AirGreen
On a particularly hot afternoon in Saint-Lambert , a customer contacted us urgently. Their Midea wall-mounted air conditioner had suddenly stopped blowing cold air. In a sunny house near Gordon Park, the indoor temperature was rising rapidly. At AirGreen , we know how disruptive such a breakdown can be to daily comfort, especially during the summer. We therefore dispatched a technician to the site the same day.
Diagnosis of the problem: a temperature sensor failure
Upon arrival, our technician performed a complete system check . The wall unit, installed above a south-facing window, was displaying a flashing red light , indicating an error code related to the indoor temperature sensor . After removing the front panel and testing the electronic components with a multimeter, he confirmed that the thermistor – the temperature sensor – was no longer transmitting the correct values to the electronic board.
This type of problem is quite common in Midea air conditioners that have been in use for several years. Prolonged exposure to direct heat or fine dust can impair the sensor's accuracy and cause the unit to shut down.
Intervention: replacement of the thermistor and complete cleaning
We undertook the replacement of the defective sensor with an original Midea part. During this intervention, the technician took advantage of the device opening to carry out a complete cleaning of the coils and the fan . A slight fouling had started to reduce the airflow, aggravating the overheating of the sensor.
The steps followed:
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Safe disconnection of the power supply.
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Removing the panel and accessing the electronic card.
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Disassembly of the original thermistor , then installation of the new calibrated sensor.
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Gentle steam cleaning of the heat exchange fins.
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Restart and calibrate the system.
Within an hour, the air conditioner was blowing steady cold air again, reaching 21°C in the room in just 15 minutes.
Result: restored comfort and optimized performance
After the repair, we performed several performance tests. The R-32 refrigerant gas pressure was found to be stable, confirming that there was no leak. The unit responded perfectly to the remote control commands, and the customer immediately felt an improvement in comfort and cooling speed .
We advised him:
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Have the filters cleaned every 4 to 6 weeks , especially during peak season.
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Avoid leaving the device running continuously under direct sunlight without a break.
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Schedule a complete annual maintenance before each summer to prevent premature wear of electronic components.
AirGreen expertise serving South Shore residents
At AirGreen , we work daily on Midea, Fujitsu, Sharp, Gree and Daikin wall-mounted air conditioners in Montreal, Laval, Longueuil, the North Shore and the South Shore . Our team is distinguished by its speed of intervention , its precise diagnosis and the use of original manufacturer parts for each repair.
Every service call is an opportunity for us to restore not only thermal comfort, but also the customer's confidence in their HVAC system. Whether it's a faulty sensor, a damaged circuit board, a refrigerant leak, or a clogged drain , our technicians are trained to ensure a safe and lasting repair.
In conclusion
This Midea wall-mounted air conditioner repair in Saint-Lambert perfectly illustrates the AirGreen philosophy: respond quickly, diagnose correctly, and repair efficiently . Thanks to this approach, our customers enjoy fresh, healthy air while extending the life of their system.