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Réparation d’une thermopompe centrale Zephyr à Rosemont–La Petite-Patrie
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Repair of a Zephyr central heat pump in Rosemont–La Petite-Patrie

A heat pump failure on a flat roof: AirGreen expertise at work

At AirGreen , we know that HVAC systems installed on the flat roofs of Montreal buildings require special attention. Exposed to wind, rain, and temperature fluctuations, this equipment requires rigorous maintenance to maintain its performance and reliability. Recently, our team intervened in Rosemont–La Petite-Patrie to repair a broken Zephyr central heat pump on the roof of a small residential building.

Initial observation and customer call

The client, an apartment building owner, contacted us after receiving several complaints from tenants: no unit seemed to be producing heat despite the thermostat being set. The cool spring temperatures made the situation urgent.

Our team arrived the next morning. Upon arrival, the outdoor compressor , mounted on a galvanized steel support on the roof, was completely shut down despite the indoor system being in demand. The environment also showed signs of aging: slightly oxidized metal pipes, accumulation of rainwater, and exposed power cables.

Fault diagnosis

Our technicians carried out a complete diagnosis of the Zephyr heat pump :

  1. Electrical check : No power was reaching the main contactor—first indication of a power problem.

  2. Wiring and fuse inspection : A blown fuse in the rooftop junction box was identified. This type of fault, often caused by a power surge or temporary short circuit, prevents the compressor and fan from starting.

  3. Continuity Test : After replacing the fuse, we tested the compressor and fan. The compressor started, but the condenser fan remained stationary , indicating a faulty fan motor .

Repair and replacement of components

To ensure a lasting repair, we have taken the following steps:

  • Complete disconnection of the ventilation module for mechanical inspection.

  • Motor resistance measurement : abnormal values ​​confirmed internal winding failure.

  • Replacement of the ventilation motor with an equivalent Zephyr-certified model, compatible with the same energy efficiency.

  • Cleaning the outdoor coil , clogged with accumulated dust and debris, to restore optimal heat transfer.

  • Preventive fuse replacement and circuit voltage test.

Once restarted, the heat pump restarted without any anomaly. Temperature measurements at the duct outlet confirmed a difference of more than 18°C ​​between the ambient air and the blown air , proof of optimal operation.

Immediate results and benefits

Thanks to this intervention, the client was able to:

  • Restore the interior comfort of the entire building.

  • Reduce your electricity consumption by avoiding forced operation of the indoor unit.

  • Prevent a more costly breakdown , as a compressor forcing itself without ventilation could have overheated and deteriorated.

The Zephyr system is now ready to face the warm season with stable and quiet performance. We also advised the owner to schedule biannual preventive maintenance , especially recommended for rooftop installations.

Special features of flat roof installations

Rooftop HVAC systems in Montreal present several challenges:

  • Direct exposure to the weather , leading to premature corrosion of components.

  • Wind vibrations , which can loosen electrical and refrigeration connections.

  • Accumulation of water or ice , risking damage to the supports.

At AirGreen , we adapt our approach to these constraints:

  • Use of raised galvanized steel supports to keep units away from puddles.

  • Application of a protective treatment on flare connections and housings.

  • Systematic verification of grounding and line voltage .

AirGreen Expertise in Rosemont and throughout Montreal

This intervention demonstrates our commitment to providing fast, accurate, and safe HVAC repair services. Our technicians are trained to work on flat roofs and in a variety of weather conditions, with full compliance with safety standards.

We work on all brands: Zephyr , Goodman , Midea , Fujitsu , Sharp , Lennox , Gree , and many others. Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we provide consistent and professional service.

Recommendations for building owners

To maintain the proper functioning of a central rooftop heat pump:

  1. Schedule maintenance before summer and before winter.

  2. Keep coils and filters clean.

  3. Have the refrigerant pressure and the condition of the insulation on the pipes checked .

  4. Monitor the fan noise : any abnormal grinding or vibration may indicate a fault.

Conclusion

This Zephyr central heat pump repair in Rosemont–La Petite-Patrie demonstrates the importance of accurate diagnosis and methodical intervention. At AirGreen , every service call is treated with the same high standards, whether it's for simple maintenance or a major breakdown.

With our expertise in HVAC repair in Montreal , we extend the lifespan of equipment while optimizing its energy efficiency — a profitable investment for building owners and managers.