How much does it cost to fix Worcester Bosch error code F7 228?

Typical repair cost for the Worcester Bosch F7 228 fault is £150-300 including labour.

F7 228 High

Worcester Bosch F7 228 Fault Code

Q: What does the Worcester Bosch F7 228 fault code mean?

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.

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 13 Worcester Bosch models in our database.

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 27 April 2026