BoilerFaultCodesYour boiler has detected a flame signal even though it hasn't started the burner yet, which is causing it to shut down for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: An ionisation current was measured before the burner started
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame or electrical current before the ignition process has even begun. The most common reason is a buildup of carbon or moisture on the sensing electrode that tricks the system, or a faulty gas valve that is slightly leaking fuel into the combustion chamber.
This issue can be more frequent during periods of high humidity or heavy rain, as moisture entering the flue can interfere with the sensitivity of the electrical flame-sensing components.
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.
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A boiler cover plan would cover faults like F7228 — no call-out fees, no surprises.
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