A service call for an outdoor heat pump that would no longer start
At AirGreen , we were called to intervene in an apartment in the Côte-des-Neiges–Notre-Dame-de-Grâce neighborhood of Montreal, for a Goodman wall-mounted heat pump installed on a narrow balcony. The client reported that his system, after several days of heat, refused to start despite attempts to restart it via the remote control.
The outdoor compressor, installed against a red brick wall typical of buildings in the area, appeared to be electrically powered , but no start-up or ventilation sounds could be heard.
Initial diagnosis and basic checks
Our certified technician performed a complete inspection of the HVAC system , starting with the outdoor unit.
First observations:
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The condenser fan was not spinning.
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The main contactor was not receiving the control signal.
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The indoor unit's electronic board was not transmitting the starting voltage.
At the same time, the wall-mounted heat pump showed signs of accumulated condensate , suggesting that the indoor unit was operating in hibernation mode after a power surge.
Testing and fault location
Using our digital diagnostic tools, we confirmed that the 24V signal that was supposed to activate the compressor was not being sent. The likely cause:
A faulty internal control board – a known issue on some Goodman models after multiple thermal overload cycles.
To ascertain the cause, our team has:
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Measured the continuity of the communication cable between the two units.
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Tested the compressor start relay .
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Visually inspected the electronic card : a burnt micro-trace confirming the fault.
Component repair and replacement
A new original Goodman control board was installed on site. Before connecting it, we took care to:
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Clean oxidized connectors .
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Check the system grounding .
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Insulate cables exposed to moisture from the balcony.
Once the board was replaced and reprogrammed, the system restarted normally. The compressor started with a smooth start , and the condenser fan resumed its full cycle.
Final checks and adjustments
To ensure optimal performance, we have carried out:
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A reading of the refrigeration pressures : in accordance with the operating values.
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A check of the blowing temperature : 11°C difference between the inlet and outlet air.
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A drain check to ensure no water is accumulating on the balcony.
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Mechanical securing of the outdoor unit with anti-vibration pads , reducing resonances on the concrete floor.
Result: restored comfort and a more reliable system
Thanks to AirGreen's rapid response, the customer was able to regain the full comfort of their Goodman wall-mounted heat pump , which is now quieter and more responsive. The outdoor unit was positioned for better ventilation , ensuring optimal performance even during the hottest summer months.
Personalized advice for the client
We recommended to the owner:
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Have the control board inspected every two years, especially in installations exposed to humidity.
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To maintain free space around the outdoor unit , avoiding any obstruction.
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Carry out preventive cleaning of the indoor unit filters at least every change of season.
AirGreen expertise in Montreal's urban neighborhoods
Balcony installations, like this one in Côte-des-Neiges, require specific technical expertise . At AirGreen , we know how to adapt our interventions to the space, noise and ventilation constraints specific to residential buildings in Montreal, Laval, Longueuil, the North Shore and the South Shore .
We always favor sustainable solutions , with original parts , rigorous diagnostics and secure installation .
Reliable, accurate and professional service
Every repair we perform has the same goal: to maximize the lifespan of your HVAC system while improving its energy efficiency . This work on a Goodman wall-mounted heat pump once again demonstrates the difference between a simple repair and a technical overhaul by AirGreen.