Flame detected after gas High

Worcester Bosch Flame detected after gas Fault Code

Q: What does the Worcester Bosch Flame detected after gas fault code mean?

Your boiler thinks it can still see a flame even though it has told the gas to turn off, which is causing it to shut down for safety.

Q: How much does it cost to fix Worcester Bosch error code Flame detected after gas?

Typical repair cost for the Worcester Bosch Flame detected after gas fault is £150-450 including labour.

Also written as FLAMEDETECTEDAFTERGAS — same fault.

The Worcester Bosch Flame detected after gas fault code means: your boiler thinks it can still see a flame even though it has told the gas to turn off, which is causing it to shut down for safety.. It appears on 1 Worcester Bosch model in our database.

Technical description: Cables and connections to gas valve. Gas valve switched off. Condensate trap. Flue (for blockages). Otherwise replace control board.

Typical repair cost £150-450 (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 Flame detected after gas fault code

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

Greenstar i Repair: £150-450

Source

Worcester Bosch Flame detected after gas 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