A service call under a gallery that spoke volumes
At AirGreen , we were recently contacted for a Midea wall-mounted air conditioner repair in Pointe-Claire , on the West Shore of Montreal . The call came from a concerned customer: his outdoor unit, installed high up under a back porch, was making an abnormal noise and was no longer cooling his home effectively. The installation, suspended from the brick wall using metal brackets, was already showing several signs of wear and poor drainage.
Initial diagnosis: a risky setup
Upon our arrival, our certified technician noticed several peculiarities:
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The Midea outdoor unit was mounted under a wooden deck, restricting airflow around the condenser.
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The metal supports were solid, but not level , causing an amplified vibration each time the compressor started.
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A flow of condensed water was stagnating on the structure, leaving traces of humidity on the brick.
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Access for regular maintenance was very restricted, making it difficult to clean the coils.
These elements explained the reduced performance and noise pollution reported by the owner.
Step 1: Electrical and Circuit Pressure Check
We first turned off the power and opened the service panel. The start capacitor was reading abnormally—23 µF instead of the expected 35 µF for this model. This imbalance was causing the compressor to start up suddenly and increasing its internal temperature.
Then, the refrigeration pressure reading revealed a refrigerant level slightly below the standard, with no immediate visible signs of leakage. We therefore planned a more extensive electronic detection test to confirm the leak.
Step 2: Cleaning and Realignment
The customer mentioned that the unit had not been serviced for two summers. We performed:
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A thorough cleaning of the coils using a biodegradable Midea SafeClean™ degreaser.
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Dusting the fan and checking the balance blade.
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Tightening the fasteners and adding anti-vibration pads under the support plate to reduce noise transmitted to the structure.
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A unit level correction with a millimeter adjustment of the support arms to improve condensate drainage.
Step 3: Partial recharge and performance test
Once the checks were completed, we added 100g of R410A refrigerant to achieve the optimal pressure. Start-up then took place without excessive noise, and the discharge temperature stabilized quickly.
After 20 minutes of operation , the temperature differential between the indoor air inlet and outlet reached 10.8°C , confirming that performance had returned to compliance with the manufacturer's specifications.
Step 4: Advice to the client
We recommended to the owner:
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Carry out annual maintenance on your wall-mounted air conditioner before each hot season.
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Possibly install a rain shield or top deflector to protect the unit from runoff from the deck.
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To consider, in the medium term, repositioning the condenser to improve air circulation and facilitate maintenance.
The client particularly appreciated the immediate reduction in noise, and the return to uniform freshness in his kitchen and living room opening onto the terrace.
Why this case illustrates our AirGreen approach well
Every repair, even on a seemingly simple Midea wall-mounted air conditioner , requires a comprehensive analysis: electrical, mechanical, positioning, acoustics, and drainage . At AirGreen, our approach is never limited to “fixing the symptom”—we address the root cause to ensure the system’s longevity.
With our expertise in brands like Midea, Fujitsu, Gree, Sharp and Zephyr , we guarantee a service tailored to every type of installation , whether it's a downtown condo or a multi-level home on the North Shore or South Shore.
Final result: comfort and tranquility restored
At the end of our visit, the client found:
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A silent system , without vibration or rumbling.
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Reduced energy consumption .
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Fast and stable cooling , even on the hottest days.
This type of intervention perfectly illustrates our mission: to offer residents of Montreal, Laval, Longueuil, the North Shore and the South Shore a reliable, rigorous and human HVAC service.