BoilerFaultCodes 1.0.0 High
Boiler Fault Code 1.0.0
Also written as 100 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 1.0.0 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 internal control system is struggling to 'talk' to its main computer, meaning it has paused operations as a safety precaution. (As reported on Baxi 825 Combi)
Pick your boiler brand for the 1.0.0 fix
Source
Information for the 1.0.0 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 7 July 2026