An LG wall-mounted heat pump offers year-round comfort, energy efficiency, and performance. However, even the most reliable systems can show subtle signs of trouble before a complete breakdown. At AirGreen, we know that early intervention can make all the difference between a minor repair and a costly replacement. In this article, we highlight five hidden signs that it’s time to call in a qualified technician for your LG wall-mounted heat pump, whether you’re located in Montréal, Laval, Longueuil, the North Shore or the South Shore.
The invisible signs you should never ignore
Your heat pump may still seem to be working, even when something inside isn’t quite right. Here are five warning signs you should take seriously.
1. Subtle temperature fluctuations throughout your home
Even if the air coming from your indoor unit feels warm or cool, frequent changes in temperature between rooms may point to a sensor calibration issue or airflow restriction. This could be due to a clogged fan motor, a blocked filter, or an electronic malfunction within the LG system. In several cases across Laval and Longueuil, our technicians found that this inconsistency was an early warning sign of a bigger issue—like a faulty control board or refrigerant leak.
2. A slight increase in your energy consumption
LG heat pumps—especially newer Inverter models—are built to be energy-efficient. If you notice a sudden spike in your electricity bill, without any changes in your usage habits, this could mean the compressor or heat exchanger is running inefficiently. In Montréal, we recently helped a client whose LG Art Cool Mirror 12,000 BTU heat pump was using more power than usual. The culprit? Invisible buildup on the outdoor coil that was hindering performance.
3. Subtle but unusual noises
Most people associate mechanical problems with loud, persistent sounds. But the first warning signs are often more discreet—intermittent clicks, light vibrations, or short high-pitched whistles. On the South Shore, a customer in Brossard called us about a faint noise they couldn’t quite place. Our diagnosis? An internal fan drum slightly out of alignment. Left unaddressed, this issue could have damaged other components.
4. A faint odor when turning the unit on
If you notice a musty smell, plastic odor, or metallic scent, even occasionally, this could indicate moisture buildup inside the unit, microbial growth in the ducts, or worse—a component overheating. Our technicians have encountered this in places like Blainville on the North Shore, where LG units that weren’t properly maintained developed internal corrosion from poor drainage.
5. The outdoor unit looks fine, but the performance is off
One of the trickiest symptoms: everything looks normal, but the comfort is missing. For instance, the airflow may feel lukewarm in cooling mode, or only slightly warm in heating mode. This is often caused by a refrigerant imbalance or a malfunctioning reversing valve—issues that aren’t visible from the outside. In Longueuil, we recently serviced an LG Dual Inverter 18,000 BTU heat pump whose output had dropped by 40%, despite everything looking fine on the display.
How to avoid costly repairs
Regular preventive maintenance is key. From our experience across Greater Montréal, most expensive failures could have been avoided with an annual inspection. At AirGreen, we offer HVAC maintenance plans tailored to LG models, ensuring your equipment’s longevity and your peace of mind.
What does a full AirGreen inspection include?
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Refrigerant level check
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Internal electrical connection inspection
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Deep cleaning of coils and filters
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Fan and compressor performance test
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Advanced electronic diagnostics using LG-specific tools
Our certified technicians provide quick, safe, and accurate service, using tools and expertise that are perfectly suited for LG Art Cool, Dual Inverter, Standard Plus, and other models.
Case Study: Intervention in Montréal – Hidden issue with a 24,000 BTU LG unit
A client in Rosemont contacted us at the end of winter. Their 24,000 BTU LG wall-mounted heat pump seemed to be working, but the house stayed cold. After an inspection, we discovered a minor refrigerant leak, invisible to the naked eye. Thanks to our specialized pressure test, we pinpointed a factory weld micro-leak. After replacing the damaged section and recharging the system, full performance was restored. Result: optimal comfort and an immediate drop in energy consumption.
Why trust AirGreen?
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Certified LG HVAC specialists
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Real-world experience throughout Montréal, Laval, Longueuil, North Shore, and South Shore
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Fast and transparent service
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Personalized advice for every residential or commercial setup
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Expertise in energy standards and available government rebates (LogisVert, Rénoclimat, etc.)
Available grants for LG heat pumps
Even if your current unit is showing signs of trouble, a replacement may be eligible for significant financial incentives, up to $5,000 depending on the LG model and your location. Our experts will guide you through every step to secure available rebates.
Take action before a total breakdown
The longer you wait, the higher the risk. A full breakdown can happen without warning, especially during a heatwave or cold snap. By recognizing these five hidden signs, you take proactive steps to preserve your home’s comfort, your LG heat pump’s performance, and your wallet.
At AirGreen, we’re ready to step in quickly to diagnose, maintain, or repair your unit—wherever you are in Greater Montréal.
Book your appointment today for a full inspection or repair: our team is ready with the skills, certified LG parts, and commitment to deliver exceptional service.