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Réparation d’un climatiseur mural LG à Saint-Lambert
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LG wall-mounted air conditioner repair in Saint-Lambert

When reliability meets a setback: a precise and efficient service call

At AirGreen , we know that an LG wall-mounted air conditioner is synonymous with performance and durability. However, like any heating, ventilation, and air conditioning (HVAC) unit, there may be times when maintenance or repair is required. This is exactly what happened at a residence in Saint-Lambert , on the South Shore of Montreal , where our team was called to resolve an unexpected breakdown.

The context of the intervention

The customer contacted us after noticing that his LG wall-mounted air conditioner was no longer producing cold air, despite the operating indicator light being on. The outdoor system appeared to be active, but no cooling was felt inside. A classic problem for wall-mounted units at the start of the season , often linked to a lack of maintenance or a refrigerant leak.

On site, our technician Alexandre quickly confirmed that the outdoor unit—an LG wall-mounted condenser —was showing signs of overheating: the fan was working, but the compressor was shut off for safety reasons. This was a first indication that the R-410A refrigerant gas was likely low.

Accurate diagnosis and safety above all

Before any manipulation, our team carried out a complete check of the HVAC circuit :

  • System pressures : below normal values.

  • Visual inspection : no visible traces of oil on the fittings.

  • Nitrogen leak test : micro-leak detected at the flair connection between the compressor and the suction line.

  • Capacitor check : voltage and capacity conform.

  • Electrical wiring checked : no faults found.

This micro-leak perfectly explained the gradual loss of performance observed by the customer. It had caused the refrigerant level to drop , reducing the system's ability to transfer heat and forcing the compressor to overheat.

LG wall-mounted air conditioner repair: precision and thoroughness

Once the diagnosis was confirmed, our technician undertook the complete repair of the flair seal :

  1. Depressurization and safe recovery of remaining refrigerant.

  2. Remanufacture of the flair with tooling calibrated for 1/4 in. and 3/8 in. copper.

  3. Application of a special sealing paste for HVAC fittings.

  4. Extended pressure test at 350 psi for validation.

  5. Vacuum draw down to 500 microns to eliminate all traces of moisture.

  6. Recharge the system with the exact amount of R-410A according to the LG nameplate.

Each step was carried out in compliance with the safety and energy efficiency standards required by AirGreen and the manufacturer LG.

Result: restored comfort and optimal efficiency

As soon as it was restarted, the LG wall-mounted air conditioner returned to optimal operation:

  • Blowing temperature: 10°C at the outlet of the indoor unit.

  • Compliant pressures: 120 psi (low) / 410 psi (high).

  • Sound level: perfectly stable.

  • No vibration feedback or leakage.

The client immediately noticed an improvement in indoor comfort , which was particularly appreciated during this warm spring day. We also recommended annual maintenance to prevent any recurrence, including a thorough cleaning of the coils and indoor fan .

Why use AirGreen for your LG air conditioner repairs?

LG units are renowned for their inverter technology and exceptional energy efficiency. However, their electronic precision and compressor sensitivity require certified and experienced technicians . At AirGreen:

  • We are experts in diagnostics on inverter systems .

  • We exclusively use tools calibrated for R-410A and R-32 .

  • We guarantee interventions that comply with Canadian CSA and RBQ standards .

  • We offer fast service in Montreal, Laval, Longueuil, on the North Shore and the South Shore .

Maintenance tips for your LG wall-mounted air conditioner

To extend the life of your device:

  • Clean the interior filters every 4 to 6 weeks.

  • Clear the outdoor condenser area of ​​any leaves or debris.

  • Avoid extension cords : always plug the unit into a dedicated circuit.

  • Schedule an annual professional inspection , ideally in the spring.

These simple actions not only ensure optimal energy efficiency , but also prevent costly breakdowns .

In conclusion

This LG wall-mounted air conditioner repair in Saint-Lambert perfectly illustrates the importance of thorough diagnostics and regular maintenance. Thanks to our fast and accurate service, the customer's system is now operating at full capacity, ready to face the summer heat.

At AirGreen , we combine technical expertise , transparency and local service to ensure the comfort and peace of mind of every household in the metropolitan area.