I Unknown

Boiler Fault Code I

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code I appears across 5 boiler brands and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Pick your boiler brand for the I fix

Ariston I 1 model Baxi I 1 model Main I 1 model Potterton I 1 model Worcester Bosch I 2 models

Source

Information for the 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 31 August 2026