6C Emergency

Worcester Bosch 6C Fault Code

The Worcester Bosch 6C fault code means: your boiler is detecting a flame inside the unit even though it isn't being asked to heat your home or water, causing it to shut down for safety.. It appears on 4 Worcester Bosch models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Flame detected with no demand
Typical repair cost £180-350 (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 6C fault code

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

Source

Worcester Bosch 6C 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