Your boiler has detected a problem with the sensor that monitors the temperature of the water used for your radiators, causing the heating to stop working.

Fault on Central Heating Sensor

What causes this fault?

This fault occurs when the boiler's internal computer receives an incorrect or missing signal from the sensor that monitors your radiator water temperature. The most common reason is that the sensor has physically failed due to age, though it can also be triggered by loose or corroded electrical connections between the sensor and the main control board.