What does the Worcester Bosch 204 fault code mean?

Your boiler has shut down because the water inside its internal loop has become hotter than the system is programmed to allow.

How much does it cost to fix Worcester Bosch error code 204?

Typical repair cost for the Worcester Bosch 204 fault is £150-300 including labour.

Current primary water temperature higher than set val.

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

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.