BoilerFaultCodesTechnical description
Ignition, pilot or flame proving fault
What causes this fault?
This fault occurs when the boiler's internal safety system fails to detect a constant flame after several attempts to spark. The most common reasons are a blocked pilot jet preventing gas flow, a worn-out ignition lead that can no longer create a spark, or a faulty sensor that cannot confirm the flame is actually lit.
This issue often surfaces after a long summer break when debris or spiders' webs have settled in the pilot tube, blocking the small amount of gas needed for ignition.
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.
Find a Gas Safe engineer
Search the official register →