BoilerFaultCodesYour boiler detects a flame when there shouldn't be one, so it has shut down as a safety precaution to prevent gas from flowing incorrectly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical 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 fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like F7228 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch CDi Classic is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.