Your boiler has stopped working because it cannot detect a stable flame, often due to a problem with the gas supply or a faulty internal sensor.

Problem on combustion feedback signal – gas pressure needs checking.

What causes this fault?

This fault occurs when the boiler's internal computer tries to light a flame but cannot detect a stable fire through its sensors. The most common reasons are a disruption in the gas supply to the house, a buildup of carbon on the sensing probe, or a mechanical failure of the gas valve that prevents the fuel from flowing correctly.