An AirGreen intervention to restore the comfort of a family living room
At AirGreen , we were called for an HVAC repair service in a cozy residence in Outremont , an iconic neighborhood of Montreal . The client contacted us after noticing that their Sharp wall-mounted heat pump was no longer blowing hot air consistently. This breakdown, which occurred at the beginning of the cool season, threatened the comfort of the living room, the main room of the house.
Our team moved quickly to carry out a complete on-site diagnosis and restore system performance as quickly as possible.
Initial diagnosis: temperature fluctuations and faulty sensor
Upon arrival, we noticed that the indoor unit, discreetly installed above the seating area, was operating intermittently. The customer reported alternating between warm and cool air , accompanied by a slight clicking noise . These symptoms immediately pointed us to a problem with the temperature sensor (thermistor), a key component in room temperature control.
Our technician proceeded to:
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A check of the refrigeration pressures on the refrigerant circuit.
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A test of the room temperature sensor and the coil sensor.
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A visual inspection of the electronic card to detect any micro-cracks or signs of overheating.
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A complete cleaning of the filter and turbine to remove any obstruction to the airflow.
Analysis confirmed that the internal thermistor was transmitting an erroneous reading, causing the heating cycle to stop prematurely.
Sensor replacement and system recalibration
To restore optimal operation, our team replaced the defective sensor with an original Sharp part compatible with the ZU1 range , frequently installed by AirGreen. Once the new thermistor was installed, we:
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Reset the electronic controller to clear stored error codes.
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Readjusted the sensor calibration to match the actual ambient temperature.
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Checked compressor performance and indoor fan modulation.
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Measured the inlet/outlet temperature differences to confirm the efficiency of the heat exchange.
The result was immediate: the heat pump regained its full performance , diffusing stable and silent heat throughout the main room.
A comfortable living room again and a controlled atmosphere
This Outremont home reflects a balance between aesthetics and modern comfort : a tastefully decorated living room, paintings on the walls, carefully aligned solid wood guitars... The Sharp wall unit, strategically positioned above the relaxation area, fits perfectly into this decor while ensuring uniform thermal comfort .
After the repair, we took the time to explain to the customer the importance of preventative maintenance , including regular cleaning of the filters and dusting of the turbine to prevent the engine from overheating.
Maintenance tips offered by AirGreen
Our experts point out that 90% of wall-mounted heat pump breakdowns can be prevented with professional annual maintenance. Here are our recommendations:
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Clean air filters every 4 to 6 weeks.
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Avoid obstructing air circulation around the indoor unit.
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Schedule professional maintenance before each heating or cooling season.
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Watch for unusual noises or sudden temperature changes.
These simple actions extend the life of the system and optimize its energy efficiency.
AirGreen expertise: rigor, precision and personalized service
Every service call at AirGreen is handled with the same rigor, whether it's a simple sensor failure or a complete compressor replacement . Our priority is to restore our customers' comfort while ensuring long-lasting performance of their HVAC systems.
We operate in all boroughs of Montreal , as well as in Laval, Longueuil, on the North Shore and the South Shore , with a fleet of certified technicians available 7 days a week.
Conclusion: a refurbished Sharp system in Outremont
Thanks to a quick and precise intervention, this Outremont customer's Sharp heat pump is now operating at full capacity. The heating is stable, the temperature consistent , and the noise level minimal, allowing them to fully enjoy this beautiful living space.
At AirGreen , we believe that the quality of a repair is measured as much by the durability of the solution as by the customer's peace of mind . This philosophy guides each of our HVAC interventions in the greater Montreal area.