When a compressor failure threatens the comfort of a Montreal condo
At AirGreen , we know how essential a wall-mounted heat pump is to ensuring consistent comfort in Montreal's urban homes. Recently, our team was called for a repair service in the Outremont neighborhood, where a customer experienced a complete breakdown of their LG heat pump .
The unit, installed on a brick back deck, had stopped producing heat and air conditioning. Upon our arrival, a thorough diagnosis was required.
Diagnosis: An inactive compressor and damaged wiring
The customer reported that their heat pump had stopped responding, with no operating noise. At first glance, the LG outdoor unit appeared intact, but a thorough electrical inspection revealed a critical issue: the power wiring was damaged near the wall, likely due to moisture infiltration or degradation over time.
Our technicians carried out a series of checks:
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Voltage test at the connection terminal to confirm the absence of stable power supply.
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Compressor and fan inspection : no start attempt.
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LG control module internal fuse check - blown due to power surge.
Once these observations were made, we identified the root cause: a localized short circuit caused by a bare wire, which had blown the compressor protection.
Intervention: Wiring replacement and complete system reset
Our HVAC repair procedure consisted of several steps:
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Safe disconnection of the outdoor unit.
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Replaced damaged electrical wiring and added a weatherproof protective sleeve.
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LG compressor thermal fuse replacement .
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Complete cleaning of the condenser compartment , removing accumulated dust and debris.
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Power up and performance testing .
Upon restart, the heat pump returned to smooth and quiet operation . We then checked the R-410A refrigerant pressures and confirmed that the level remained stable, ruling out any leaks.
Result: restored efficiency and prevention of future breakdowns
The customer noticed a noticeable improvement in airflow and a stable indoor temperature within the first few minutes. We took the time to explain some essential preventative measures to extend the life of his LG heat pump:
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Clean the internal filter regularly , especially before each peak season.
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Visually check external cables and avoid any accumulation of water nearby.
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Schedule an annual service with an AirGreen certified technician for a deep cleaning and pressure check.
Thanks to this rapid intervention, the heat pump's energy performance was restored, and the Outremont customer can once again enjoy optimal comfort, summer and winter.
AirGreen expertise in Outremont and throughout the Island of Montreal
At AirGreen, we operate throughout Montreal—from Ville-Marie to Rosemont , including Lachine and Outremont —to offer a heat pump repair service renowned for its thoroughness and reliability. Our technicians are trained to quickly diagnose any fault, whether it's an LG compressor, a Fujitsu electronic board, or a leak on a Midea heat pump.
Our goal: to extend the lifespan of your HVAC equipment while maximizing its energy efficiency.
Some signs that a heat pump repair is necessary:
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The outdoor unit no longer starts or trips the electrical panel.
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The system blows warm or cold air without reaching the requested temperature.
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You hear an unusual noise (creaking, clicking, whistling).
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A buildup of frost appears on the condenser.
If you notice any of these symptoms, don't wait for a complete breakdown . At AirGreen, we respond quickly throughout Montreal, Laval, Longueuil, the North Shore, and the South Shore to restore your HVAC systems to perfect working order.
Conclusion: a personalized and sustainable service
This LG wall-mounted heat pump repair in Outremont perfectly illustrates our approach: technical precision, transparency, and commitment to customer satisfaction. In just a few hours, we not only got the unit back up and running, but also secured its installation to prevent any recurrence.
At AirGreen, every service call is treated as an opportunity to bring back to life a system essential to daily comfort .