A service call for restored comfort
At AirGreen , our teams are regularly called upon to diagnose and repair wall-mounted air conditioners that suddenly stop cooling or exhibit operating anomalies. Recently, we were contacted by a customer in Saint-Lambert , on the South Shore of Montreal , whose Sharp wall-mounted air conditioner was showing a noticeable loss of performance. Despite regular maintenance, the unit was blowing lukewarm air, a clear sign of an internal problem.
In-depth on-site diagnosis
Once on site, our technicians performed a complete inspection of the wall-mounted unit. This Sharp model, with a capacity of approximately 12,000 BTUs , is typical of modern residential installations. We first checked the R-32 refrigerant pressure , temperature sensors , and internal electronic boards . We quickly discovered that the system had a minor leak at the evaporator connections —a common problem on units installed for more than five years, especially if defrost and cleaning cycles are not performed regularly.
Diagnostic steps:
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Checking the blowing temperature and thermal differential.
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Inspection of the fins and coil of the indoor unit.
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Static pressure test of the refrigeration circuit.
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Leak detection using an electronic detector.
Technical intervention: repair and upgrade
After locating the leak, we proceeded to a complete mixing of the pipes and then tightening and cleaning of the flare fittings . The next step was a 45-minute vacuum to remove any traces of moisture, before recharging the system with R-32 refrigerant according to the manufacturer's specifications, Sharp.
Once the circuit was pressurized and stabilized, we restarted the air conditioner. The measurements now indicated a blowing temperature of 17°C , perfectly within the standards for this type of model. The customer immediately noticed a difference in comfort, confirming the return to optimal performance .
Technical details of the repair:
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Brand: Sharp
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Type: Wall-mounted air conditioner
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Capacity: 12,000 BTU
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Refrigerant: R-32
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Problem: Gas leak at the fittings
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Solution: Repair the leak, draw a vacuum, completely recharge
AirGreen tips to avoid recurring breakdowns
We took advantage of this visit to remind the client of some good practices:
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Have the filters cleaned every 2 to 3 months to avoid overloading the compressor.
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Schedule an annual maintenance before the hot season to detect any micro-leaks.
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Avoid turning off the power supply during the winter, as some units perform automatic protection cycles.
Preventive maintenance not only helps avoid costly repairs, but also extends the life of the device by several years.
Why trust AirGreen to repair your wall-mounted air conditioner?
Our team combines technical expertise , cutting-edge tools , and a personalized local approach . Each intervention in Montreal, Laval, Longueuil, on the North Shore or the South Shore benefits from the same level of attention.
Whether it's a refrigerant leak , an electronic card problem , or a compressor malfunction , our certified technicians will be able to efficiently diagnose and repair your system.
We service all the popular brands on the market: Sharp, Fujitsu, Gree, Midea, Goodman, Lennox, Bosch, Zephyr , and many more. Our priority: ensuring your comfort all year round , with durable and guaranteed repairs.
In summary
This intervention in Saint-Lambert perfectly demonstrates the importance of an accurate diagnosis and professional repair . Thanks to our rigor and expertise, the customer's Sharp wall-mounted air conditioner is now operating at full capacity, ready to face the summer heat.
For any HVAC repair in Montreal , Laval , Longueuil , on the North Shore or the South Shore , AirGreen remains your trusted partner.