An urgent service call for a compressor failure in the heat
At AirGreen , we often receive calls from concerned customers when their air conditioning system or wall-mounted heat pump suddenly stops working—especially during periods of extreme heat. This is exactly what happened in Sainte-Thérèse , on Montreal's North Shore , where a homeowner contacted us after noticing that their Goodman wall-mounted heat pump was no longer producing cold air despite the outdoor fan being on.
Upon our arrival, our technicians observed a Goodman condenser mounted on the south-facing gray brick exterior wall, typical of suburban homes. The installation appeared old and showed signs of wear: faded paint, aged external wiring, and a slightly oxidized bracket. These details already gave us clues as to the likely cause of the failure.
Precise diagnosis: compressor blocked and circuit breaker to be checked
Our team performed a complete electrical system check : supply voltage, external circuit breaker, fuses, and wire continuity. No breaks were detected. Next, using a multimeter , we tested the compressor start capacitor —a common failure on aging Goodman units.
Result: the capacitor showed a capacity much lower than the standard, preventing the compressor from starting correctly. We also noticed an internal clicking noise , a sign that the motor was trying to start without success.
The diagnosis was clear:
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Defective starting capacitor
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Risk of compressor overheating
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Slight loss of energy efficiency due to age of unit
Repair and recommissioning: a rapid and lasting intervention
To prevent further damage, we replaced the starting capacitor with a genuine Goodman part and then checked the refrigerant charge. A slight pressure drop was detected, allowing us to top up with R-410A refrigerant to restore the system to optimal performance.
Before closing the panel, we cleaned the condenser fins and adjusted the electrical connections in the control box. After powering up, the compressor started immediately, and the air blown inside was 8°C cooler than the ambient temperature —a performance that met Goodman standards.
Result: comfort restored and maintenance recommended
The client was able to return to a comfortable temperature in his living room as soon as we left. We advised him:
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A complete annual cleaning of the wall-mounted heat pump to prevent dust and corrosion.
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An inspection of the wall bracket , slightly weakened, to avoid long-term vibrations.
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Installing a winter protection windbreak , to extend the life of the compressor during cold seasons.
This intervention illustrates AirGreen's philosophy: to diagnose quickly, repair sustainably, and ensure constant comfort for families in the greater Montreal area.
Why Choose AirGreen for Your Goodman Heat Pump Repairs
Our certified technicians are fully familiar with the Goodman range, whether it's wall-mounted, central, or multi-zone heat pumps. With our fully equipped trucks, we can service a wide area covering Montreal, Laval, Longueuil, the North Shore, and the South Shore , with most replacement parts readily available.
Our advantages:
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Precise on-site diagnosis
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Guaranteed repairs that meet CSA standards
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Compliance with R-410A and R-32 refrigerant systems
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Fast, professional and courteous service
At AirGreen, every intervention is carried out with care, transparency, and efficiency—so that your HVAC equipment provides you with reliable comfort, season after season.
In summary
In Sainte-Thérèse , the repair of this Goodman wall-mounted heat pump brought a system that was at the end of its life cycle back to life, thanks to a rigorous diagnosis and targeted intervention. This service call demonstrates once again the importance of regular preventative maintenance to avoid costly breakdowns and summer inconveniences.