How much does it cost to fix Worcester Bosch error code Red light?

Typical repair cost for the Worcester Bosch Red light fault is £120-250 including labour.

Red light High

Worcester Bosch Red light Fault Code

Q: What does the Worcester Bosch Red light fault code mean?

Your boiler has stopped working and entered a safety shutdown mode, likely because it hasn't been used for a while or has failed to ignite.

Also written as REDLIGHT — same fault.

The Worcester Bosch Red light fault code means: your boiler has stopped working and entered a safety shutdown mode, likely because it hasn't been used for a while or has failed to ignite.. It appears on 2 Worcester Bosch models in our database.

Technical description: Red light. FFO (Off) / Lock-out. Gas valve closes. Boiler unused long period.

Typical repair cost £120-250 (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 Red light fault code

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

Source

Worcester Bosch Red light 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