A Midea wall-mounted air conditioner that no longer blew cold air
At AirGreen , we were called about an air conditioning problem in an apartment in the Côte-des-Neiges–Notre-Dame-de-Grâce neighborhood of Montreal. The customer complained that their Midea wall-mounted air conditioner was no longer producing cold air, even after several restarts and a cursory cleaning of the filters. With the arrival of warm temperatures, it was essential to restore comfort quickly.
Diagnosis: weakened airflow and a clogged exchanger
Upon arrival, we performed a complete inspection of the indoor unit.
The first observation: the air flow was very low despite the functional fan.
Upon opening the front panel, our technicians discovered several anomalies:
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A thick layer of dust and dirt stuck to the filters.
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Blocked evaporator fins , preventing air from passing through.
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Traces of moisture at the bottom of the condensate collection tray.
This type of fouling is typical of a lack of annual maintenance , and can quickly cause the evaporator to freeze or even cause complete compressor failure.
Cleaning and refurbishing the indoor unit
Step 1: Protection and disassembly
Before any operation, the area around the air conditioner was protected using tarpaulins and masking tape , in order to avoid any splashes on the walls and furniture.
We then removed the grilles, filters and the lower casing to access the evaporator and the turbine.
Step 2: Deep Cleaning
Using a biodegradable cleaning product , we have:
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Cleaned the evaporator to remove dust, bacteria and greasy residue.
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Degreased the blower turbine using a fine brush and a low pressure rinse.
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Cleaned the condensate tray and checked that the drain was flowing properly.
We then rinsed the assembly with fresh water to restore the thermal conductivity of the exchanger.
Step 3: Check the temperature sensor
During cleaning, we noticed that the indoor air temperature sensor had moved slightly. After repositioning it correctly, the air conditioner was able to accurately detect the room temperature, ensuring better control of the cooling cycle.
Outdoor unit control
Once the indoor unit was reconditioned, we inspected the outdoor condenser .
The fan was operating normally, but the refrigeration circuit pressure was slightly lower than normal:
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Low pressure: 95 psi
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High pressure: 375 psi
We therefore completed the charge of R410A refrigerant , respecting the specifications of the manufacturer Midea. A nitrogen leak test was also carried out to confirm the integrity of the circuit.
Post-repair performance tests
After the system has been fully restarted:
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Airflow has been restored to 100%.
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The measured blowing temperature : 8°C , an excellent performance for this model.
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The noise level has been significantly reduced, a sign of balanced airflow.
The customer immediately felt the difference: a quickly cooled room and smooth operation, without excessive noise or temperature fluctuations.
The importance of an annual interview
This case demonstrates how preventative maintenance can prevent costly problems.
Simply cleaning the filters is not enough to maintain the performance of a wall-mounted air conditioner.
At AirGreen, our interviews systematically include:
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Complete cleaning of the evaporator and condenser.
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Control of refrigeration pressures.
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Inspection of electrical connections and sensors.
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Checking the condensate drain and turbine.
This maintenance guarantees optimal energy efficiency , extended lifespan and healthier indoor air .
AirGreen: expertise and reliability in Montreal and throughout the region
This Midea wall-mounted air conditioner repair in Côte-des-Neiges–Notre-Dame-de-Grâce perfectly illustrates our commitment: to provide professional, fast and long-lasting HVAC service .
We operate throughout the metropolitan area — Montreal, Laval, Longueuil, North Shore and South Shore — for the maintenance, repair and installation of air conditioning systems and heat pumps of all brands.
At AirGreen , each intervention is carried out with precision, attention to detail and compliance with the strictest standards in the HVAC field.