A quick and efficient service call for restored comfort
At AirGreen , we know that a broken wall-mounted air conditioner can quickly turn a pleasant day into a source of frustration—especially in tight spaces or spaces with limited airflow, such as stairwells. This is exactly the situation we faced during this service call in Côte Saint-Luc , where a Fujitsu wall-mounted air conditioner had stopped effectively cooling the landing of a single-family residence.
The context of the intervention
The unit, installed halfway up a central staircase, served both the upper corridor and the ground floor. This type of location is common for maximizing air distribution, but it often complicates maintenance. The client reported a noticeable decrease in cold airflow , accompanied by a slight clicking noise each time the compressor started.
Our team of technicians quickly arrived on site to perform a complete diagnosis of the system.
Detailed diagnosis
As soon as we switched on, we noticed that:
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The indoor fan was running, but the airflow remained low.
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The compressor was turning on intermittently.
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A buildup of dust and micro-debris was clogging the filter and evaporator fins.
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The refrigerant pipes showed slight abnormal condensation, indicating a possible imbalance in the refrigerant charge.
These symptoms pointed the diagnosis towards a partial lack of refrigerant (probably R-410A) and insufficient maintenance of the indoor module.
The steps of repair
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Complete cleaning of the indoor unit
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Disassembly of the hood and removal of the filters.
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Application of AirGreen biodegradable cleaner to remove dirt accumulated on the evaporator.
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Low pressure rinse to avoid damaging the aluminum fins.
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Inspection of the refrigeration circuit
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Static and dynamic pressure test of the circuit.
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Checking the flare fittings and the insulating sleeve.
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Detection of a micro-leak at the expansion connection .
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System repair and reload
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Localized welding of the leaking connection.
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Complete vacuum draw for 20 minutes.
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Recharge the system to the exact amount recommended by Fujitsu.
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Final check
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Blowing temperature measurement: 9.8°C (perfect for optimal operation).
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Automatic defrost cycle control.
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Observation of a regular and quiet air flow.
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Result: comfort and efficiency restored
Once the repair was completed, the difference was immediate: the customer noticed uniform cooling throughout the stairwell, without excessive noise or sudden compressor shutdowns. The energy efficiency of the unit was also optimized, which will result in a reduction in electricity consumption .
AirGreen Tips to Extend the Life of a Wall-Mounted Air Conditioner
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Clean your filters every two months during the summer season.
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Schedule annual preventative maintenance , ideally before the first heat wave.
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Ensure good air circulation around the indoor unit (do not block the flow with furniture or curtains).
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Watch for unusual noises : these are often the first signs of mechanical or pressure imbalance.
AirGreen expertise at your service
This intervention in Côte Saint-Luc perfectly illustrates our approach: diagnose accurately, intervene effectively and prevent future breakdowns . At AirGreen, each service call is an opportunity to demonstrate our expertise in repairing residential HVAC systems , whether it is heat pumps , wall-mounted air conditioners or multi-zone systems .
We serve the entire Greater Montreal area daily, including Laval , Longueuil , the North Shore and the South Shore , always with the same rigor and the same passion for lasting comfort.