1.0 Low

Boiler Fault Code 1.0

Also written as 10 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 1.0 appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently performing an automatic internal check or initial setup process and is not experiencing an actual fault. (As reported on Baxi 825 Combi)

Pick your boiler brand for the 1.0 fix

Baxi 1.0 1 model Malvern 1.0 1 model

Source

Information for the 1.0 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