High
2912 on Worcester Bosch Greenstar 27CDi

Your boiler is struggling to start the internal fire necessary to produce heat, meaning 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.

Technical description

No flame signal during calibration

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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Related fault codes

EAView →227View →2911View →

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