BoilerFaultCodes E100 Low
Boiler Fault Code E100
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E100 appears across 1 boiler brand and 26 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer has lost track of the time or date, which can prevent your heating schedules from working correctly. (As reported on Baxi EcoBlue)
Pick your boiler brand for the E100 fix
Source
Information for the E100 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