High
Burner goes out on Ferroli Sigma

Your boiler is struggling to stay lit because it is either dirty or isn't getting a steady flow of gas.

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

Insufficient gas supply. Boiler dirty. Burner or injector dirty. Faulty flow temperature sensor

Shared across the Sigma 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.
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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All 8 fault codes on the Sigma

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

37121Boiler lockoutBoiler sootingBurner fails to igniteCondensate in boilerRadiators cold in winter

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