A broken LG unit under a balcony: a typical case of lack of preventive maintenance
At AirGreen , we often work on residential installations where the exterior configuration directly influences the system's performance. This was the case in Saint-Lambert , on the South Shore of Montreal , where a customer contacted us about an LG wall-mounted air conditioner that was no longer producing enough cold despite the unit starting normally.
The outdoor unit, discreetly installed under a concrete balcony, appeared to be protected from the elements. However, this arrangement had a side effect: insufficient air circulation , causing the compressor to gradually overheat and reduce efficiency.
Initial diagnosis: an overloaded compressor and limited heat exchange
Upon arrival, we noticed that the LG Inverter condenser lacked enough clearance to ensure proper air exchange. The hot air being discharged was trapped under the balcony structure, forcing the compressor to operate at full load.
Our technical checks revealed:
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Too high discharge temperature .
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Condensing pressure exceeding recommended limits.
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Slight overheating of the compressor , signaled by the electronic module.
Thermal analysis and pressure measurement confirmed that performance was hampered by poor condenser ventilation and partial fouling of the coil .
Step 1: Thoroughly clean the condenser and clear the airflow
Our technicians began by thoroughly cleaning the outdoor coil , using a biodegradable cleaner and a low-pressure rinse. This step is essential to allow the system to efficiently dissipate heat.
We then advised the client to slightly raise the position of the condenser , in order to improve air circulation under the balcony. We installed anti-vibration spacers that allow the hot air to dissipate better, while reducing the vibrations transmitted to the structure.
Step 2: Checking the refrigerant and inverter module
Once the airflow was optimized, we checked the R-410A refrigerant charge . The level was found to be slightly below the standard, the result of a micro-leak at a service connection.
We have :
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Locate the leak with an electronic detector.
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Repaired the seal at the Schrader port.
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Pulled a complete vacuum from the system.
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Recharged the circuit according to LG specifications.
The inverter module, responsible for controlling the compressor speed, was also tested and recalibrated. No major electrical faults were found.
Step 3: Interior Check and Performance Test
On the inside, the LG wall module displayed adequate airflow but a discharge temperature that was too high before the intervention. After recharging, we measured a cooling of more than 11°C between the air inlet and outlet—proof of restored efficiency.
An extended 20-minute test confirmed:
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A stable compression cycle.
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A sound level that meets specifications.
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Reduced electricity consumption by approximately 15%.
Final result: comfort restored and system optimized for summer
The customer immediately noticed a difference in indoor comfort. His LG wall-mounted air conditioner was as efficient as a new unit, with a uniform temperature throughout the rooms.
Our technicians took the time to explain good maintenance practices:
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Clean the internal filter every two months during the warm season.
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Avoid obstructing the condenser air outlet with objects or plants.
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Have the system inspected every spring to prevent microleaks and maintain energy performance.
Why call AirGreen for your LG wall-mounted air conditioner repair?
At AirGreen, we are familiar with LG's inverter technology and its unique features: sensitive electronic control, variable-speed compressor, and the need for a perfect balance between pressure and temperature.
Our teams respond quickly throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , to ensure precise, reliable and long-lasting service.
We always favor a preventive and educational approach: our customers understand the causes of the problem and leave with a fully functional system — and useful knowledge for the future.
AirGreen Advice:
Installing a condenser under a balcony is possible, but it requires careful planning for ventilation and hot air removal. If in doubt, request a free assessment—our technicians will recommend the ideal adjustments to extend the life of your unit.
AirGreen – Your HVAC expert for LG air conditioner repair and maintenance in Montreal, Laval, Longueuil, North Shore and South Shore.