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

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

Red - blinking High

Worcester Bosch Red - blinking Fault Code

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

Your boiler has detected an internal issue where it thinks it should be running but has stopped a critical internal circulation component for safety.

Also written as REDBLINKING — same fault.

The Worcester Bosch Red - blinking fault code means: your boiler has detected an internal issue where it thinks it should be running but has stopped a critical internal circulation component for safety.. It appears on 5 Worcester Bosch models in our database.

Technical description: Abnormal running mode (pump stopped but still functioning).

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 Red - blinking fault code

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

Source

Worcester Bosch Red - blinking 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