What does the Worcester Bosch E9 224 fault code mean?

Your boiler has switched itself off because it has detected that the internal gases have become too hot, which is a safety measure to prevent damage.

How much does it cost to fix Worcester Bosch error code E9 224?

Typical repair cost for the Worcester Bosch E9 224 fault is £120-£350 including labour.

Max thermostat activated – flue gas thermostat overheat

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.