What does the Worcester Bosch E9 fault code mean?

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.

How much does it cost to fix Worcester Bosch error code E9?

Typical repair cost for the Worcester Bosch E9 fault is £150-300 including labour.

Safety temperature limiter (heat exchanger) or flue gas limiter has triggered

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.

Work through these before the call-out.

Sludge build-up — needs flushing, not bleeding.