As part of our ongoing commitment to excellence in HVAC repair throughout the Greater Montreal area, we were recently called in for a service call in Anjou to diagnose and repair a group of LG Inverter wall-mounted heat pumps installed in a multi-unit residential building. This intervention highlighted the importance of regular maintenance for outdoor units located in semi-enclosed environments, such as underground parking or concrete mezzanines.
Service Context: Call in a Semi-Enclosed Parking Area
The client, responsible for maintaining a residential building in Anjou, contacted us after noticing a drop in heating and cooling performance across several LG brand, Inverter model wall-mounted units installed in series along a concrete wall in a protected area of the building.
Residents in several apartments reported inadequate cooling during peak hours, along with increased noise and extended defrost cycles.
Technical Inspection: Particle Buildup and Airflow Obstruction
Upon arrival, our technicians performed a full visual inspection of the LG Inverter outdoor wall units. We quickly noted a heavy accumulation of fine dust, concrete residue, and microparticles around the ventilation grilles and coils. The elevated installation, directly beneath concrete slabs in a semi-enclosed space, led to poor air circulation and trapped residual heat.
We also identified several weakened electrical connections and a faulty temperature sensor on one unit, causing incorrect ambient temperature calibration and frequent compressor shutdowns.
Repair and Optimization Steps
Our experts carried out a series of targeted interventions, including:
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Deep cleaning of all outdoor units using a low-pressure water jet and non-corrosive degreasing solution suited for aluminum fins.
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Fan debris removal and straightening of damaged fins using a specialized fin comb.
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Replacement of the defective temperature sensor with a genuine LG part.
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Refrigerant pressure checks, revealing a slight imbalance on two units (R410A), which we corrected with a controlled refrigerant top-up.
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Securing electrical connections using waterproof wire clamps and re-wrapping cables with heat-shrink tubing.
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Adding plastic air deflectors at both ends of the wall to improve thermal dissipation between units.
Post-Repair Results: Restored Performance and Efficiency
Following these repairs, each unit was individually tested in both cooling and heating modes. We observed an immediate improvement in airflow, a reduction in mechanical noise, and a shorter cycle time during initial heating. Residents reported that their desired indoor temperature was reached in under 10 minutes.
The tightly packed wall-mounted layout and enclosed environment posed a significant challenge, but thanks to our expertise in wall-mounted heat pump repair in Montreal, we were able to restore the system’s performance while extending its longevity.
Long-Term Recommendations for the Client
We advised the Anjou property manager to implement the following:
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Schedule semi-annual preventative maintenance for all wall units installed in semi-enclosed areas.
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Install washable dust filters in front of the units to minimize debris buildup.
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Implement light mechanical ventilation in the area where the heat pumps are installed to promote airflow and reduce micro-pressure zones.
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Monitor monthly energy consumption to quickly detect any efficiency drops.
Why Trust AirGreen for Your Wall-Mounted Heat Pump Repairs?
At AirGreen, we understand that every service call is unique. This intervention in Anjou demonstrates our ability to adapt our methods to real-world installation conditions, while adhering to the highest standards of HVAC repair on the North and South Shores. We respond quickly, use genuine parts, and prioritize long-lasting, energy-efficient solutions.
Whether you're a condo owner, building manager, or part of a co-ownership, our teams are trained to diagnose and repair LG, Gree, Fujitsu, Haxxair, and other major heat pump brands, no matter how complex the installation.
Our Services Cover the Entire Greater Montreal Area:
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Montreal (Anjou, Ahuntsic, Villeray, TMR…)
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Laval (Chomedey, Laval-des-Rapides…)
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Longueuil (Saint-Hubert, Vieux-Longueuil…)
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North Shore (Terrebonne, Blainville, Boisbriand…)
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South Shore (Brossard, Saint-Lambert, Candiac…)
Experiencing Poor Performance from Your LG Wall-Mounted Heat Pump?
Don’t let a simple blockage or faulty component compromise your occupants’ comfort. Contact AirGreen today for a thorough technical inspection and fast repair performed by our certified specialists.
