A quick and meticulous intervention to restart a wall system in the heart of Montreal's summer
At AirGreen , we were recently called for a residential HVAC service call in Côte-Saint-Luc , Montreal. The customer noticed that their Sharp wall-mounted air conditioner was no longer blowing cold air, accompanied by a slight rubbing noise upon startup. The unit, which had been installed for several years, also showed signs of internal fouling visible under the hood.
In this type of case, rapid and precise intervention is essential, especially when the outside temperature exceeds 30°C.
Initial diagnosis: identify the cause of the lack of cold
Upon arrival, we noticed that the front panel of the air conditioner had been partially opened and that a protective plastic film had been temporarily placed by the customer to prevent dust. This indicated that a previous unsuccessful maintenance attempt had been made.
Our certified technicians carried out a series of checks:
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Complete visual inspection of the indoor unit and refrigeration lines.
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R410A refrigerant pressure measurement : insufficient level.
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Fan motor test : working correctly, but dust deposits on the blades.
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Temperature sensor and electronic board check : stable voltage, but sensor response slightly delayed.
These observations led us to a precise diagnosis: a micro-leak of refrigerant at the connection of the copper tube, coupled with significant fouling of the evaporator .
Complete repair: detection, cleaning and recharging
Step 1: Locate the leak
Using an electronic leak detector , we confirmed the presence of gas at the brazed connection between the coil and the pipe. A silver brazing repair was performed to seal the defective joint.
Step 2: Deep Clean
The indoor unit was then thoroughly cleaned with an AirGreen biodegradable agent designed to remove greasy and dusty deposits.
We used a sealed plastic shield to prevent any splashes on walls and furniture – as is often seen during professional residential cleaning.
Step 3: Leak test and refrigerant recharge
After the repair, a nitrogen pressure test confirmed the system's leak-tightness. We then recharged the heat pump with R410A to Sharp's recommended nominal pressure, ensuring optimal performance.
Result: comfort restored and performance restored
Once the system was turned back on, the cold airflow returned to full power. The customer immediately noticed a significant temperature difference within minutes.
The output data (discharge temperature at 9°C, stable pressure, no vibrations) confirm that the wall-mounted air conditioner is now operating at full energy efficiency .
AirGreen Tips to Extend the Life of Your Wall-Mounted Air Conditioner
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Clean the filters every two months during the summer season.
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Have a complete cleaning performed by a certified technician every spring.
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Avoid covering the indoor unit with non-ventilated plastic bags.
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In case of noise or decreased performance, contact an HVAC professional quickly .
AirGreen expertise: reliability, precision and proximity
Working in older residential buildings in Côte-Saint-Luc requires a thorough understanding of architectural constraints: moldings, plaster walls, and limited access. Our team takes care to preserve every detail of the home while ensuring optimal HVAC performance.
Each AirGreen intervention is distinguished by:
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A rigorous diagnosis carried out with calibrated instruments.
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Durable repairs using only certified parts and materials.
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Aesthetic attention to detail in every finish, ensuring a clean and discreet result.
Thanks to our expertise in Sharp, Fujitsu, Lennox, Midea and Gree systems , we offer solutions adapted to all models of wall-mounted air conditioners and heat pumps in the Greater Montreal area, including Laval, Longueuil, the North Shore and the South Shore .
In summary: a successful repair and a satisfied customer
This Sharp wall-mounted air conditioner in Côte-Saint-Luc has regained its full efficiency after a careful leak repair and a thorough cleaning . The customer now enjoys fresh, clean, and constant air, without noise or temperature fluctuations.
At AirGreen , every service call is an opportunity to demonstrate our expertise, our technical rigor and our commitment to the lasting comfort of our Montreal customers.
AirGreen — Your expert in HVAC system repair, installation and maintenance in Montreal and the entire metropolitan area.