Your boiler is having trouble lighting the flame when you turn on your hot water taps.

DHW ignition error

What causes this fault?

This fault occurs when the boiler fails to establish or sustain a flame specifically while trying to heat your tap water. It is usually caused by a component failure that prevents the spark from jumping or the gas from flowing correctly, meaning the system cannot safely ignite to provide heat. The most common reasons include a worn-out ignition probe or a faulty gas valve that isn't opening as it should.