BoilerFaultCodesTechnical description
The ionisation (the flame) extinguishes during operation of the unit.
What causes this fault?
This fault occurs when the boiler successfully starts but cannot maintain a stable flame, leading the safety sensors to shut the system down. The most common reasons are a worn-out sensor that can no longer 'see' the flame or an inconsistent gas supply that causes the fire to flutter and go out. It can also be caused by a buildup of carbon on the internal components which interferes with the electrical signal required to keep the boiler running.
This fault is often seen during the first cold snap of autumn when the boiler is pushed to run for longer periods after being mostly idle throughout the summer.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.