Emergency
2916 on Worcester Bosch Greenstar 4000

Your boiler has detected that a safety valve which controls gas flow did not close correctly after it finished heating, so it has shut itself down to keep you safe.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

What the manual says

Manufacturer manual

Boiler electr. system fault - Gas valve was detected as open during post-purge.

From this model's manual
Verified against the Worcester Bosch Greenstar 4000 installation & service manual, page 76.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

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

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