An NTC sensor changes electrical resistance with temperature. The boiler uses the reading for functions such as heating or hot water control, depending on where it is fitted. Sensors with similar shapes are not necessarily interchangeable.

Useful symptoms to report

Unexpected temperature readings, unstable hot water or a sensor fault message can justify investigation. The installation may also genuinely be heating too quickly or circulating poorly. Diagnosis must distinguish an inaccurate reading from a real temperature problem.

Sensor, wiring or control input?

A professional checks the reference, connections and measurements against the manufacturer’s values and actual conditions. An open or short circuit can occur in wiring as well as the sensor itself. Replacing a part without checking the circuit may leave the fault unchanged.

Installation and final checks

Some sensors contact the pipe externally while others are fitted into a hydraulic connection. The correct mounting and, where applicable, seal matter. Do not unscrew a sensor from a hot pressurised circuit. After repair, readings and appliance response should be checked through the relevant operating modes.

Arrange a diagnosis in Anderlecht

Provide the make, exact model, full fault message and when the symptom occurs. Keep the appliance accessible without opening it, and mention previous repairs or leaks. ChauffePro can discuss breakdown diagnosis, repair and servicing. Availability and the proposed work are confirmed for your installation.

Plan your intervention

See our indicative prices, project photographs and frequently asked questions. Describe your installation and access arrangements so we can prepare the next step.

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