A heat pump that is safe, but not immune to problems
When a client from Ville Mont-Royal contacted us about a Daikin wall-mounted heat pump installed in the underground garage of his building, the symptom was unusual: the unit would no longer start , even though it was indoors and protected from the elements.
Unlike outdoor installations exposed to snow and wind, this one was located in a concrete garage with mechanical protection (foam barriers) and a plastic baffle on top of the unit. At first glance, the environment seemed ideal. However, the system refused to heat up.
Diagnosis: When ambient temperature disrupts electronics
At AirGreen , we understand that installing a heat pump in a garage or enclosed space requires a specific setup. Our technicians therefore undertook a thorough inspection of the Daikin system .
The tests revealed:
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Too low ambient temperature in the garage (around 2°C), preventing the defrost sensor from recognizing normal operating conditions.
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An electronic card that was not receiving the compressor start signal.
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An outdoor fan blocked by a thin film of frost from condensation on the water drain pipe.
The problem combined both an environmental factor and an electronic anomaly .
Repair: targeted intervention on the card and optimization of the installation
Our technicians have undertaken the following steps:
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Disassembly and complete inspection of the electronic panel.
After measuring the voltages and continuities, we noticed a worn power relay on the main board. -
Replaced the relay with an original Daikin part, then tested for continuity and reset the module.
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Thorough cleaning of the fan and front grille to remove the thin layer of frost.
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Adjusted the boot configuration to adapt the system behavior to a semi-closed environment.
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Added a small additional thermal sensor , allowing the garage temperature reading to be corrected.
These adjustments allowed the system to resume stable and continuous operation, without the risk of short cycles.
Results: Smooth operation and better adaptation to the location
After the repair, the Daikin heat pump restarted immediately. We observed:
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A stable blowing temperature of 42°C in the rooms served.
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A regular operating cycle , even in the cold garage.
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Standardized electricity consumption .
We also advised the client to add passive ventilation to the room to prevent moisture buildup and frost buildup on the front grille—a detail often overlooked in garage installations.
AirGreen expertise: understanding the context, not just the machine
This case perfectly illustrates our approach at AirGreen : an HVAC repair is not just about replacing a defective part . It's about understanding the system's overall environment —temperature, airflow, positioning—to ensure sustained performance.
Our technicians regularly work in similar environments:
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Condominium garages in Ville Mont-Royal, Outremont or Côte Saint-Luc.
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Technical premises of buildings in Montreal, Laval and Longueuil.
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Commercial facilities partially closed on the North Shore and South Shore.
Each context requires adaptation of the electronic settings and airflow to guarantee the performance and longevity of the equipment.
AirGreen Tips for Garage or Semi-Enclosed Space Installations
To avoid similar breakdowns, our specialists recommend:
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Ensure minimal ventilation in the room where the outdoor unit is located.
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Avoid covering the unit completely , even with a baffle. Free air circulation is essential.
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Schedule preventative maintenance every 12 months to clean coils and check electronic components.
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Install temperature sensors adjusted for atypical environments.
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Check for condensation regularly to prevent water from leaking and freezing.
Conclusion
This intervention in Town of Mount Royal demonstrates that even a protected indoor installation can present unique challenges. Thanks to a precise diagnosis and technical adaptation, AirGreen helped this Daikin wall-mounted heat pump regain its efficiency and reliability.
Our mission remains the same with every call: to optimize the performance of each HVAC system , whether installed on a roof, an exterior wall or in a garage, everywhere in Montreal, Laval, Longueuil, on the North Shore and the South Shore .