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.

Manufacturer manual

Current primary water temperature higher than set val.

Shared across the Greenstar 8000 Style range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

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

Boiler cover options

A cover plan would handle faults like 204: no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Affiliate links. We may earn a commission at no extra cost to you.

Seeing a different code? Every code this model can display, in one place.

Almost always a stuck diverter valve on a combi.

Each noise points to a different fault.

On a combi it is usually the diverter valve. On a system boiler, the motorised valve.