F7 228 High

Worcester Bosch F7 228 Fault Code

Also written as F7228 — same fault.

The Worcester Bosch F7 228 fault code means: your boiler has detected an unexpected signal that suggests it might not be safely detecting when the flame is actually on or off, so it has locked itself out to prevent a potential hazard.. It appears on 5 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Ionisation current detected before burner-start
Typical repair cost £150-300 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the F7 228 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch F7 228 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026