A typical Montreal service call
At AirGreen , we receive numerous calls each summer regarding Sharp wall-mounted air conditioner breakdowns . One of these calls came from a bright apartment in Montreal's Côte-des-Neiges neighborhood. The customer, concerned that his unit was no longer blowing cold air despite the normal display on the remote control, wanted a quick diagnosis before the next heat wave.
Step One: Sharp Wall System Inspection
Upon our arrival, our certified technician conducted a complete inspection of the Sharp wall-mounted heat pump , a model from the ZU1 series , powered by R-32 refrigerant . The indoor unit was well installed, securely fastened to a corner wall, but an abnormal vibrating noise was coming from the lower flap. Externally, the compressor appeared intact, with no traces of oil or apparent leaks.
We have checked:
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Air filtration : The filters were saturated with fine dust, reducing airflow.
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The condensate drain : slightly clogged, which caused moisture to build up in the tray.
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Refrigerant pressure : slightly lower than normal, indicating a possible micro-leak.
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The interior fan motor : noisy and running irregularly.
Diagnosis: a combination of factors
After analysis, we identified three joint problems:
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A partial lack of R-32 refrigerant , reducing cooling capacity.
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A dirty fan motor , slowing down air circulation.
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Poor condensate drainage , promoting slight internal condensation.
These combined failures explained the loss of performance, unusual noise, and the sensation of warm air despite the compressor apparently working.
Complete repair on site
Our technicians carried out:
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A thorough cleaning of the Sharp wall unit: filters, evaporator fins and drain pan.
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Complete clearing of the condensate pipe using a gentle pressure jet.
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An R-32 recharge after detection and sealing of a micro-leak at the flare connection.
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Replacement of the interior fan motor , the bearings of which showed significant wear.
The whole thing was done in about 1 hour 45 minutes , without any major dismantling of the installation.
Result: immediate comfort
Upon restart, the unit was blowing air at 7°C at the outlet , compared to 18°C before our intervention. The operating noise had disappeared and the customer was able to notice a return to the original performance of his Sharp air conditioner . We also recommended annual preventive maintenance before each summer to avoid the recurrence of micro-leaks and dirt blocking the airflow.
AirGreen Tips to Extend the Life of Your Wall-Mounted Air Conditioner
For our clients in Montreal, Laval, Longueuil, the North Shore and the South Shore , we recommend:
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Clean the filters every 4 to 6 weeks during the summer period.
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Have the refrigerant level inspected every two years.
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Schedule professional maintenance in the spring to avoid breakdowns during heat waves.
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Watch for warning signs : decreased performance, water dripping on the wall, or unusual noises.
These simple actions help extend the life of the Sharp, Fujitsu, Gree, Midea and other brand units that we maintain daily.
Expertise and proximity: the AirGreen signature
At AirGreen , we know that every service call is unique. That's why our technicians are trained to quickly diagnose any type of residential HVAC breakdown , whether it's a wall-mounted heat pump , a multi-zone system , or a single wall-mounted air conditioner . With teams spread across Greater Montreal , we respond quickly, whether you're in Côte-des-Neiges, Chomedey, Sainte-Julie, or Terrebonne .
Our commitment: to offer a precise, transparent and sustainable service, with repairs carried out according to the rules of the art and always in compliance with the environmental standards in force in Quebec.
AirGreen — HVAC repair in Montreal, Laval, Longueuil, North Shore and South Shore.
Your comfort is our priority, summer and winter.