When a forgotten maintenance turns into a complete breakdown
At AirGreen , we regularly receive emergency calls for wall-mounted air conditioners that suddenly stop working in the middle of the hot season. This is exactly what happened during our recent intervention in Sainte-Catherine , on the South Shore of Montreal . The client, the owner of a modern semi-detached house, contacted us after noticing that his Midea air conditioner had stopped blowing cold air for several days.
Initial diagnosis: a completely clogged evaporator
Upon arrival, our certified technician immediately noticed that the indoor unit had been partially disassembled by the customer, hoping to identify the fault himself. Upon removing the faceplate, we observed an evaporator covered in a greasy, dusty layer , as well as a fan clogged with dirt . These deposits prevented normal airflow, forcing the compressor to run relentlessly—a common cause of overheating and premature failure.
We then carried out a series of tests:
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Checking the airflow and blower motor.
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Measurement of refrigerant pressure using electronic pressure gauges.
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Inspection of the condensate drain , often responsible for internal water leaks.
The verdict was clear: the problem stemmed from missing maintenance for more than two years , resulting in thermal blockage of the evaporator coil and a drop in energy efficiency of more than 40% .
Repair steps and deep cleaning
Our technicians undertook a complete cleaning of the interior module :
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Complete disassembly of the front panel and cylindrical fan.
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Application of a biodegradable cleaning product specially designed for aluminum coils.
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Rinsing under controlled pressure , allowing to dissolve grease and encrusted dust without damaging the fins.
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Suction of the condensate tray and disinfection of the drain pipe to prevent the formation of mold.
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Electrical check of the control board and temperature sensors.
Once these steps were completed, the unit was tested in cooling mode and quickly returned to its original performance: 16°C air outlet , reduced noise level and smooth operation.
An important reminder: Preventive maintenance extends lifespan
This case perfectly illustrates the importance of annual HVAC maintenance . A simple preventative cleaning would have prevented this breakdown, reduced energy consumption, and extended the life of the Midea air conditioner.
We often remind our customers that:
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A clogged filter reduces airflow and overloads the compressor.
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Dirty coils result in higher electricity consumption.
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Lack of maintenance may void some manufacturer warranties.
That's why we offer an AirGreen seasonal maintenance program , including inspection of pressures, drainage, electrical connections and overall system performance.
Final result and customer satisfaction
After the restart, the customer immediately noticed a difference:
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Fresher, consistent air in every room.
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Reduced fan noise.
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No water leaks observed after 24 hours of use.
We also took the time to explain to the customer the correct maintenance practices : clean the filters every three weeks, avoid blocking air circulation, and plan a complete maintenance every spring.
At AirGreen , we believe that a high-performance air conditioner is a well-maintained air conditioner. Our local expertise in Sainte-Catherine , as well as throughout the South Shore, Laval, and Montreal , allows us to offer fast, professional, and long-lasting service, regardless of the brand— Midea, Gree, Fujitsu, Sharp, or Daikin .
In summary
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Initial problem: Midea wall-mounted air conditioner not cooling, fan blocked by dust.
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Diagnosis: Severe fouling of the evaporator, lack of maintenance.
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Solution: Complete cleaning, disinfection, verification of the board and sensors.
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Result: Cooling restored, optimal performance, satisfied customer.
Regular maintenance isn't a luxury: it's insurance against costly breakdowns. At AirGreen , we do more than repair— we bring your HVAC systems back to life .