F7 228 High
Your boiler has detected a flame signal even though it hasn't started the burner yet, which is causing it to shut down for safety.
Technical description: An ionisation current was measured before the burner started
Typical repair cost: £120-£350 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F7 228 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation electrode
- Flame sensing lead
- Control PCB
- Gas Valve
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