A service call while climbing the stairs
At AirGreen , our technicians often work in unusual residential settings. On this day, our team went to Brossard , on the South Shore of Montreal , to diagnose a Fujitsu wall-mounted heat pump installed high above a main staircase. The customer reported a sudden drop in heat , accompanied by an intermittent metallic noise coming from the indoor unit.
An accurate diagnosis despite difficult access
Upon arrival on site, our technician noted several critical points:
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The wall-mounted unit, installed nearly three meters above the ground, made access difficult for regular maintenance.
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The interior temperature sensor was not responding properly, causing the compressor to operate erratically.
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Dust and pollen deposits were visible on the evaporator fins, indicating a lack of periodic maintenance.
After securing access with a telescopic ladder, we carried out a complete electrical diagnosis of the control board and thermal probes.
Repair steps and complete restoration
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Power off and remove the front cover to access the boards and sensors.
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Thorough cleaning of the heat exchanger with a biodegradable cleaner suitable for Fujitsu systems.
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Replacement of the defective room sensor , responsible for the erroneous temperature reading.
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Lubricated the fan motor and realigned the shaft to eliminate the reported metallic noise.
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Checking the communication between the indoor unit and the outdoor compressor , ensuring a stable thermodynamic cycle.
Once the repair was completed, we carried out a full operational test in heating and cooling mode : the unit now reached the required temperature in a few minutes, with a constant and quiet airflow.
Result: comfort restored throughout the stairwell
The effect was immediate. The client, who previously complained of a 4°C difference between the floors , regained uniform thermal comfort . The Fujitsu heat pump, now perfectly calibrated, efficiently distributes heat in the open space connecting the living room and the upper floor.
We recommended annual maintenance , particularly important for units located at height:
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Cleaning the filter and evaporator coil.
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Checking the probes and condensate.
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Inspection of the outdoor compressor, often neglected during the winter.
These simple actions help extend the life of the heat pump while maintaining optimal energy performance.
AirGreen expertise: precision, safety and performance
Repairing a wall-mounted heat pump located in a stairwell requires experience, precision, and the right tools. Our AirGreen technicians are trained to:
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Work at height safely.
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Quickly diagnose electronic or thermal faults .
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Optimize performance without disturbing the internal structure.
We work with the most reliable brands on the market —Fujitsu, Sharp, Midea, Gree, Goodman, Bosch, Lennox—and we master their technical specificities, whether they are probes, control cards, or infrared sensors.
Why use AirGreen for your wall-mounted heat pump?
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Fast and professional service throughout Greater Montreal.
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RBQ certified and insured technicians .
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Accurate and transparent diagnosis before each repair.
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Availability 7 days a week during the warm and winter season.
Each service call is an opportunity for us to demonstrate our expertise and our commitment to the comfort of Montreal families.
Conclusion: a refurbished Fujitsu heat pump in Brossard
This intervention in Brossard perfectly illustrates our approach: technical rigor, preventive maintenance, and attention to detail. By replacing a simple sensor and performing a complete cleaning, we restored this Fujitsu wall-mounted heat pump to its original efficiency.
At AirGreen , we believe every repair is an opportunity to improve the overall performance of an HVAC system and extend its lifespan—for lasting comfort, season after season.