Section I High

Boiler Fault Code Section I

Also written as SECTIONI — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Section I appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is failing to light the flame or stay lit, meaning it cannot produce heat or hot water because it cannot detect a flame. (As reported on Alpha 240XE)

Pick your boiler brand for the Section I fix

Alpha Section I 1 model Baxi Section I 2 models

Source

Information for the Section I fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026