What does the Worcester Bosch E9 277 fault code mean?

Your boiler has reached an unsafe temperature and shut itself down to prevent overheating and internal damage.

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

Typical repair cost for the Worcester Bosch E9 277 fault is £120-280 including labour.

Check that all radiator valves are fully open to allow water to flow.

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.

Sludge build-up — needs flushing, not bleeding.

Work through these before the call-out.