When a heat pump breaks down in a historic West Shore house
At AirGreen , every service call tells a unique story. This time, our team visited a charming, recently renovated century-old home in Beaconsfield . The owner, passionate about architectural preservation, had installed a Fujitsu wall-mounted heat pump to ensure modern comfort while preserving the rustic aesthetic of his interior.
One January morning, he contacted us: his indoor unit was no longer blowing hot air, and the remote control screen was displaying a flashing error code. In a house with wood and lime walls, the stable heat provided by this system was essential.
AirGreen Diagnosis: a faulty temperature probe
Our technicians immediately suspected a fault related to the indoor temperature sensor . After a thorough diagnosis using our Fujitsu reading equipment, several points were verified:
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Error code 00-07 , corresponding to a defective recovery thermistor;
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Incorrect temperature measured on the electronic card;
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Indoor fan operating intermittently;
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No refrigerant leaks were detected, which ruled out a pressure problem.
The main cause: the internal sensor clogged with dust and humidity variations due to the wooden structure. Over time, these elements can distort the temperature reading and disrupt communication between the control board and the sensor.
Complete intervention: replacement, cleaning and recalibration
In order to restore optimal operation, we carried out a complete intervention on the Fujitsu interior module :
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Replacement of the air return sensor with an original Fujitsu part.
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Deep cleaning of the coil and tangential fan using a biodegradable product.
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Disinfection of the condensate tray to prevent the formation of biofilm.
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Electronic recalibration of the system to adjust the thermal reading to the actual ambient temperature.
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Checking infrared communication between the remote control and the main board.
In an hour and a half, the wall-mounted heat pump returned to a stable blower at 32°C in heating mode .
Result: comfort restored and silence restored
Once the repair was complete, the owner immediately felt the difference. The airflow was smooth and quiet, and the room temperature quickly stabilized at 21°C.
We also advised the client to:
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Clean the filter every two months , particularly during the heating season;
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Schedule annual maintenance before each winter;
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Avoid covering the wall above the unit , so as not to disturb the room sensor.
These simple actions not only guarantee constant performance, but also increased longevity of the outdoor compressor .
AirGreen expertise: between tradition and technology
The intervention in Beaconsfield perfectly illustrates our approach: combining respect for architectural heritage with modern HVAC technology . Our technicians are trained to work in all contexts—old houses, modern condos, or new constructions—and are proficient in the most popular brands: Fujitsu, Gree, Midea, Trane, Sharp, Lennox, Zephyr , etc.
No matter where you are— Montreal, Laval, Longueuil, the North Shore or the South Shore —we provide fast, reliable and long-lasting repairs for all wall-mounted and central heat pump systems.
Conclusion: AirGreen precision makes the difference
Thanks to our intervention, this Fujitsu wall-mounted heat pump has regained all of its control precision and energy efficiency. The owner can now enjoy optimal comfort without worrying about a winter breakdown.
At AirGreen, we treat every service call as a trusted mission: to protect your comfort, your investment, and your peace of mind.