When a simple malfunction hides a deeper problem
At AirGreen , we know that a wall-mounted air conditioner is much more than just a comfort device—it's an essential part of everyday well-being. In Outremont , a customer contacted us about a performance issue with a Daikin wall-mounted air conditioner , a model from the FTX range. The unit, installed near a large south-facing window, was no longer cooling the room effectively, even in turbo mode.
The system, which was several years old, had always worked well until the end of the previous summer. The customer had also noticed a repetitive clicking noise and a slightly metallic odor during startup.
Diagnosis: Faulty control board and temperature sensor
Our technicians began with a complete operational test : measuring the blower temperature, checking the airflow, and inspecting the electronic board. Within the first few minutes, the diagnosis became clear:
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the internal control board had a delayed ignition on the compressor start signal;
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the room temperature sensor no longer reacted to heat variations;
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and the flap vanes remained stuck in the closed position.
This type of failure, typical of Daikin systems after several thermal cycles, often occurs due to internal micro-condensations or slight fouling of the sensor.
Repair: disassembly, cleaning and complete recalibration
Once the unit was powered down and secured, we removed the front cover to access the control board and integrated sensors . The intervention took place in several precise steps:
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Cleaning the main board
We used a specialized dielectric cleaner to remove dust deposits and condensation residue from the connectors. -
Replacing the temperature sensor
The thermistor sensor (NTC 10K type) has been replaced with an original Daikin model. -
Soft Reset and Recalibration
Once the board was reconnected, we performed a full reset of the microcontroller , then recalibrated the temperature and airflow settings via the internal maintenance menu. -
Filter cleaning and evaporator disinfection
The filters were slightly clogged, which contributed to the drop in performance. We applied a biodegradable antibacterial product , ensuring better indoor air quality.
Performance testing and validation
After reassembly, the device was put back into service under supervision. The results were conclusive:
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blowing temperature at 9°C after 10 minutes of operation;
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instant response of the thermal probe;
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motorized shutter operating without parasitic noise.
We also inspected the refrigeration line outside for leaks and confirmed the optimal pressure of the R-410A refrigerant .
Recommendations to the customer: preventive maintenance and proper use
We advised the owner to:
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clean the filters every two months during the hot season;
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avoid placing objects or shelves too close to the unit (which limits air circulation);
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and have the electronic card checked every two years, especially in homes exposed to high humidity.
Our technicians also installed a small wall-mounted humidity sensor , visible to the right of the unit, to monitor the humidity level and prevent future electronic failures.
AirGreen expertise: precision and rigor in each intervention
Every service call we receive in Montreal, Laval, Longueuil, on the North Shore and the South Shore is handled with the same rigor: methodical diagnosis, total transparency with the customer, and lasting solutions.
In this case in Outremont, the intervention not only made it possible to repair the Daikin wall-mounted air conditioner, but also to improve its overall efficiency by almost 15% .
Our certified teams always ensure that each Daikin, Fujitsu, Midea or Gree system regains its original performance, while extending its lifespan thanks to precise adjustments and intelligent preventive maintenance .
Conclusion
This Daikin wall-mounted air conditioner repair in Outremont perfectly illustrates AirGreen's expertise in maintaining high-end wall-mounted systems. The work was carried out with precision, in compliance with Daikin standards, to ensure long-term comfort and energy efficiency.