BoilerFaultCodesTechnical description
Isioniation current detected before burner start
What causes this fault?
This fault occurs when the boiler's internal sensor detects an electrical signal signifying a flame is present before the ignition process has even started. The most common reasons are a moisture-damaged or soot-covered electrode sending a false signal, or a faulty gas valve that is leaking small amounts of gas into the combustion chamber.
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 →