Emergency night intervention on a flat roof
At AirGreen , we know that HVAC breakdowns never give warning. That's why our rapid response team was dispatched in the middle of the evening to Ville Mont-Royal for an urgent repair of an AUX wall-mounted heat pump installed on the roof of a residential building. Despite the nightfall and demanding working conditions, our technicians carried out an exemplary intervention, combining precise diagnosis and technical know-how.
Context of the intervention
The client contacted us after noticing that their AUX system was no longer producing heat, despite a constant heating demand. The heat pump, installed on a flat roof typical of multi-family buildings in the area, had stopped working during a cold fall spell.
Our technicians arrived on site in the evening to avoid a night without heating for the occupants.
Initial diagnosis
After checking the electrical connections and refrigerant pressures, our specialists quickly identified:
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A faulty external electronic board , preventing the compressor from starting correctly.
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Signs of moisture in the control box, probably caused by minor infiltration under the hood.
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Partial ice accumulations around the suction line, a sign of pressure imbalance.
Using our AirGreen ProCheck digital analyzer , we confirmed that the compressor was not damaged , and that a targeted repair was sufficient to restore the system.
Steps of repair
Our technicians proceeded methodically:
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Safe power cut-off and verification of the dedicated circuit breaker.
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Complete removal of the electronic panel from the outdoor unit.
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Dry and clean the compartment with hot air to remove all traces of moisture.
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Installation of a new original AUX card compatible with the customer's model.
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Readjustment of low voltage wiring and relay connectors.
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Power up and complete calibration of the defrost cycle.
Once the repair was complete, our technicians performed several test cycles to verify system stability, blow-out temperature, and refrigeration pressures.
Result and final checks
The AUX heat pump resumed normal operation immediately after the board was replaced.
Our measurements indicated:
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A stable suction pressure at 128 psi ,
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An indoor blowing temperature of 43°C ,
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A rated current in accordance with the manufacturer's specifications .
We also added a waterproof insulating cover to the control box to prevent any moisture from recurring.
Maintenance advice provided to the customer
Before leaving the premises, we recommended to the client:
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Have the electrical connections checked at each change of season.
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Clean the interior filters regularly to maintain good airflow.
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Plan annual preventive maintenance before the cold season.
Why trust AirGreen for your HVAC repairs in Montreal
At AirGreen, we operate in all boroughs of Montreal, Laval, Longueuil, the North Shore and the South Shore , with specialized teams for each type of system: wall-mounted, central, multi-zone and ducted heat pumps .
Our certified technicians are distinguished by:
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Their rapid and precise diagnosis ,
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The exclusive use of original parts ,
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And a transparent and professional approach to every visit.
Our goal: to restore your comfort quickly and sustainably , without compromising on the quality of service.
A word about the AUX brand
The AUX brand has established itself in the wall-mounted HVAC system sector thanks to its reliability and high energy efficiency . However, like any electronic device exposed to the elements in Quebec, it requires rigorous maintenance and seasonal checks .
Electronic board failures are among the most common due to humidity or condensation, especially for units installed on flat roofs where natural ventilation is limited.
A successful intervention under the stars
This night repair in Ville Mont-Royal perfectly illustrates AirGreen's ability to intervene quickly, even in difficult conditions .
Thanks to our expertise and rigor, the AUX heat pump has regained its full efficiency, once again ensuring thermal comfort for occupants for the coming cold season.
AirGreen — Your HVAC partner in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
For any repair of AUX heat pumps or other brands (Sharp, Gree, Fujitsu, Midea, Bosch, etc.), trust our certified technicians .