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Réparation d’une thermopompe murale Goodman au Plateau-Mont-Royal
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Repair of a Goodman wall-mounted heat pump in Plateau-Mont-Royal

An intervention at height: service call on a building roof in Plateau

In Montreal's bustling Plateau-Mont-Royal district, we were called in to repair a Goodman wall-mounted heat pump installed on the roof of a modern residential building. The installation grouped several units serving different dwellings—a typical scenario in urban condominiums where energy efficiency and reliability are essential.

The client, a property manager, had noticed that one of the Goodman units was no longer producing cold air , while the others were operating normally. The intervention required not only technical expertise, but also special attention to height safety and the management of multiple electrical interconnections .

Diagnosis: a Goodman heat pump isolated from the communication network

Upon arrival, our team secured the roof area and undertook a comprehensive assessment. Here are the main findings:

  • The Goodman condenser no longer started its compression cycle.

  • A stable supply voltage was present, but the control board was not responding.

  • The communication signal between the indoor and outdoor unit was interrupted—a common problem on rooftop installations exposed to the elements.

  • Finally, the insulation and electrical sheaths showed micro-cracks due to prolonged exposure to the sun and temperature variations.

We performed a cross-unit test to confirm that the problem was indeed the faulty outdoor control board , not the indoor thermostat or network communication.

Intervention: replacement of the control board and upgrading of the insulation

Once the diagnosis was confirmed, our AirGreen team undertook the repairs according to a rigorous protocol:

  1. Complete replacement of the Goodman control board with a certified original module, reprogrammed on site.

  2. Refurbishment of communication wiring , with double-insulated shielded wire designed to withstand UV radiation and climatic variations.

  3. Partial replacement of insulating sheaths , in order to ensure better thermal and mechanical protection.

  4. Cleaning the condenser coil with a biodegradable agent, allowing optimal heat exchange to be restored.

After power was restored, the compressor restarted immediately, displaying pressures within Goodman specifications . The cooling cycle returned to full efficiency, and the interior temperature stabilized after only a few minutes.

Result: restored performance and improved reliability

Thanks to this intervention, the Goodman unit returned to its original performance. The manager noted:

  • Uniformity of temperature between all accommodations.

  • A reduction in noise from the compressor.

  • Pressure and power consumption stability during extended testing.

We also recommended biannual maintenance of roof installations, including:

  • Checking power and communication cables .

  • Complete cleaning of the condensers to prevent overheating.

  • A visual inspection of the supporting structure and the tightness of the electrical conduits.

These preventative measures are crucial for multi-unit buildings, where a single failure can affect the comfort of multiple residents.

AirGreen expertise for high-rise installations in Montreal

At AirGreen , we regularly work on Goodman, Gree, Sharp, Fujitsu, and Midea HVAC systems installed on the roofs of residential and commercial buildings. Our team is trained to work at heights, in strict compliance with safety and energy performance standards.

Whether for maintenance, repair or complete replacement, our approach remains the same: accurate diagnosis, durable repair and guaranteed performance . We proudly serve Montreal, Laval, Longueuil, the North Shore and the South Shore , with fast and meticulous interventions.

In summary

  • Initial problem : faulty control board on a Goodman wall-mounted heat pump.

  • Solution : Replace the board, rewire and clean the condenser.

  • Result : fully functional system, restored communication and improved reliability.

On the roof of Plateau-Mont-Royal as throughout the metropolis, AirGreen remains the trusted partner for the professional repair of Goodman wall-mounted heat pumps and all your heating, ventilation and air conditioning (HVAC) needs.