Careful intervention on an aging roofing system
On the flat roofs of Boisbriand buildings, our technicians frequently encounter Goodman central heat pump systems similar to the one in this project. During this service call, the customer reported a sudden loss of performance: the system was no longer blowing cold air, and the indoor temperature was rising rapidly despite the compressor appearing to be running.
Initial diagnosis: a breakdown more complex than it appeared
Upon our arrival, our team carried out a complete diagnosis of the HVAC system . The outdoor unit, located on the roof, showed several signs of wear:
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Rust buildup on screws and protective grille.
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Condenser clogged with dirt and urban debris.
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Noisy fan motor , indicating a bearing problem.
After checking the pressures and current drawn by the compressor, we found an imbalance in the refrigeration cycle , suggesting a failure of the start capacitor .
Step 1: Check the Capacitor and Fan Motor
The start capacitor , a critical component for starting the compressor and fan, was below the nominal tolerance. This defective component explained the random motor start and intermittent cooling reported by the customer.
We replaced the capacitor with a Goodman compatible model, carefully calibrated to the system's electrical specifications.
At the same time, we lubricated the fan motor shaft and tightened the electrical connections in the control box, an often overlooked but crucial step for the durability of the system .
Step 2: Complete cleaning of the condenser
Over the years, the fins of the outdoor heat exchanger had become partially clogged, drastically reducing heat transfer efficiency. We performed a deep low-pressure cleaning using a biodegradable cleaner specifically designed for HVAC surfaces.
This cleaning improved air circulation and reduced the condensing temperature , a key factor in extending compressor life.
Step 3: Pressure Check and Calibration
Once the system was reassembled, we restarted the heat pump and measured the pressures in cooling mode. The values stabilized within the optimal range recommended by Goodman. We then adjusted the calibration of the indoor thermostat , which is often the cause of an incorrect room temperature reading.
End result: restored performance and satisfied customer
After the intervention, the heat pump resumed its optimal operation . The airflow was strong and constant, the interior temperature dropped quickly, and the electricity consumption normalized.
We have also installed surge protection to prevent possible electrical damage caused by voltage fluctuations, which are common on commercial building rooftops.
Maintenance advice given to the customer
Before leaving the site, our technicians reminded the customer of some good maintenance practices :
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Clean the internal filters every two months.
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Visually inspect the condenser at each change of season.
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Schedule annual preventative maintenance to check system pressures, connections, and cleanliness.
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Avoid blocking airflow around the rooftop condenser.
At AirGreen , we always emphasize the importance of prevention : a well-maintained heat pump consumes less energy, offers better comfort, and extends its lifespan.
Proof of AirGreen’s know-how in Boisbriand
Every repair is an opportunity for us to demonstrate our HVAC expertise . With experience working with brands like Goodman, Gree, Fujitsu, Midea, Lennox , and many others, we can quickly identify the source of the problem, whether it's a faulty capacitor , a stuck motor , or a damaged control board .
We cover all of Greater Montreal , including Montreal, Laval, Longueuil, the North Shore and the South Shore , with the same objective: to quickly and permanently repair your heating and air conditioning systems.