A fast and accurate service call
At AirGreen , we were recently called to Sainte-Julie for an urgent repair on a Midea wall-mounted air conditioner that was showing obvious signs of internal failure. The customer noticed a lack of cooling and an intermittent metallic noise as soon as the system was turned on. The indoor unit, although seemingly clean, revealed a more complex technical problem hidden beneath its hood.
On-site diagnosis: a drainage fault and a blocked fan
Upon our arrival, our technician performed a complete inspection of the interior panel . The drain hose was partially hanging loose, causing a slight flow of water down the wall. This symptom, often seemingly harmless, can quickly cause moisture damage and impair the performance of the air conditioner.
Upon disassembling the front panel, we found that the fan roller (drum) was partially clogged with greasy dust and micro-deposits . This buildup prevented the motor from running at full speed, creating a regular rubbing noise and significantly reducing the flow of cold air.
Steps of repair
Our team followed a rigorous protocol:
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Complete evaporator cleaning using a biodegradable AirGreen product formulated for delicate HVAC surfaces.
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Extraction of the fan drum , then mechanical cleaning of the blades at controlled high pressure.
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Check the electronic board , particularly the motor control module (PCB), to eliminate any risk of short circuit due to humidity.
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Replacement of the drainage pipe with a more flexible heat-resistant model, ensuring a better seal and preventing future leaks.
Recommissioning and testing
Once everything was reassembled, we carried out a complete performance test :
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Blowing temperature measured at 7.3°C after 10 minutes of operation.
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Noise level reduced to less than 22 dB, proof of a perfectly balanced fan.
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Checking communication between the indoor unit and the outdoor compressor via the Midea Inverter link, confirming optimal synchronization.
The client, impressed by the precision and speed of our intervention, was able to enjoy immediate comfort in his home, without the need for major part replacement.
Technical details of the device
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Brand : Midea
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Type : Wall-mounted air conditioner (mini-split)
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Capacity : 12,000 BTU
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Series : Mission II
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Refrigerant gas : R410A
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Device age : about 5 years
Often neglected maintenance: the common cause of these breakdowns
At AirGreen, we note that over 60% of service calls for Midea, Sharp, or Gree wall-mounted air conditioners are due to a lack of annual maintenance . Dust accumulated on the evaporator prevents proper heat exchange and overloads the fan motor. Professional cleaning, performed every spring, prevents this type of failure and extends the system's lifespan.
AirGreen Recommendations
To maintain optimal performance of your device:
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Have your wall unit cleaned by a certified technician before the summer season.
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Check regularly that the drainage is free and functional .
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Avoid using acidic or abrasive household cleaners.
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Schedule a complete annual inspection including checking pressures, the compressor and the outdoor coil.
AirGreen Expertise: a turnkey service on the South Shore
Based in Montreal, our team responds quickly in Sainte-Julie, Boucherville, Brossard, Saint-Bruno and throughout the South Shore . Each intervention is carried out by a certified technician, trained on the most widely used brands in the region: Midea, Fujitsu, Gree, Sharp, Lennox, Bosch and many others.
Thanks to our precise diagnostic process and our field experience , we ensure a lasting repair, without surprises or unnecessary replacement.
Final result
Following our intervention in Sainte-Julie, the Midea wall-mounted air conditioner is operating optimally, with energy efficiency consistent with its original installation. The customer has chosen to join our annual AirGreen maintenance program , guaranteeing preventative visits and consistent performance throughout the seasons.
AirGreen – Your reference for HVAC repair and maintenance in Sainte-Julie, on the South Shore and throughout Greater Montreal.