When we were called for an HVAC service call in LaSalle, we knew from the start that the situation would require meticulous attention. A homeowner had reported a performance issue with their Samsung Smart Inverter wall-mounted heat pump, whose outdoor unit was installed on the roof. This type of installation, although common in certain urban areas of Montreal and South Shore, comes with its share of challenges, particularly regarding stability, insulation, and protection against leaks.
Initial inspection: an elevated mounting causing problems
Upon arrival, our team conducted a visual inspection of the unit. The installation of the Samsung wall-mounted heat pump rested on a wooden base placed on a rigid foam insulation board, directly laid on the flat roof membrane. This type of mounting, although intentionally elevated to avoid direct contact with the roofing, presents several risks:
Water infiltration: standing rainwater can seep around the board, eventually damaging the roof’s waterproof membrane.
Outdoor unit instability: over time, untreated wooden supports can rot or shift, especially during the frequent freeze/thaw cycles in LaSalle.
Poor vibration absorption: inadequate mechanical insulation can cause abnormal vibrations transmitted into the interior walls.
We also noticed that some cables and lines coming from the compressor were left exposed to UV rays and weather conditions, posing a major risk of premature wear.
Symptoms reported by the client
The client mentioned a significant drop in heating performance combined with an unusual noise coming from the outdoor unit. This manifested as:
Frequent compressor starts without maintaining temperature.
Fan slowdown, especially in colder weather.
Dull, cyclical noise audible from inside the home.
Technical diagnosis of the Samsung heat pump
After powering down the unit and securing the perimeter, our certified technicians carried out a series of technical checks:
Outdoor unit mounting check: We found a base misalignment with partial settling of the wooden support at the front right.
Electrical connections inspection: The electrical entry in the side box showed signs of oxidation inside, caused by slow water infiltration.
Refrigerant pressure test: A slight pressure loss in the circuit was detected, likely caused by a connection weakened by vibrations.
Communication analysis between indoor and outdoor units: No error codes were present, but temperature reading discrepancies were noted, potentially indicating an outdoor sensor nearing end of life.
Repairs performed by AirGreen
Faced with this diagnosis, our team undertook the following actions:
Outdoor unit repositioning: We lifted the unit using a mobile lifting system, replaced the wooden base with a galvanized aluminum platform, and added rubber vibration dampers between the base and the unit.
Electrical entry refurbishment: The box was cleaned, connections replaced and sealed with a dielectric protective gel, then closed with an IP65 waterproof casing.
Partial refrigerant recharge: A calibrated recharge was performed with R-410A gas compatible with this Samsung model, while checking for leaks post-operation.
Replacement of the outdoor temperature sensor: This component was replaced with an original Samsung part, with system recalibration.
Rerouting of lines: UV protection sleeves were replaced, and the lines were secured with insulating clamps, thus avoiding stress points.
Result and client feedback
After restarting the system, we observed an immediate stabilization of the heat pump’s operation, with a rapid temperature rise inside the home. The compressor is now quieter, and heating cycles are smooth and spaced out. The client, relieved, was impressed by our level of precision and transparency throughout the intervention.
AirGreen’s expertise in rooftop HVAC service in LaSalle
At AirGreen, we understand that every situation is unique, especially when equipment is installed on the roof. The risks related to moisture, vibrations, and unprotected installations are too often underestimated. That’s why our interventions always come with practical advice to extend the lifespan of the equipment:
Use of materials suited to Montreal flat roofs (rubber feet, galvanized bases).
Enhanced protection of wiring against UV and extreme weather variations.
Leveling and securing on adjustable mounts to compensate for seasonal movements.
Why call AirGreen for your wall-mounted heat pump repairs in LaSalle?
Our certified technicians in wall-mounted heat pump repair in Montreal and South Shore respond quickly, equipped with advanced diagnostic tools. Every intervention is documented, and follow-up is offered when the situation requires it. We prioritize durable solutions that combine technical expertise with adaptation to Quebec’s climatic realities.