High
227 on Worcester Bosch Greenstar 2000

Your boiler is trying to start, but it cannot detect a flame, so it has safely shut itself down to prevent gas from building up.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

No flame signal after ignition. Check ceramic insulator, gas supply, gas valve, air intake, condensate trap, flue, burner, or electrodes.

From this model's manual
Verified against the Worcester Bosch Greenstar 27cdi installation & service manual, page 79.
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 high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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