What does the Worcester Bosch E9 277 fault code mean?

Your boiler has shut itself down because it has detected that the water inside the unit is getting too hot and reaching unsafe temperatures.

How much does it cost to fix Worcester Bosch error code E9 277?

Typical repair cost for the Worcester Bosch E9 277 fault is £120-300 including labour.

The safety temperature sensor has measured temperature in excess of 95°c

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.

Lockout fault with a reset-needed pattern.

Sludge build-up — needs flushing, not bleeding.