BoilerFaultCodes S3 High
Boiler Fault Code S3
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code S3 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's burner has shut itself down for safety because it failed to light or stay lit correctly. (As reported on Ideal Falcon Gte)
Pick your boiler brand for the S3 fix
Source
Information for the S3 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