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.

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.

Abnormal running mode (pump stopped but still functioning).

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.