BoilerFaultCodes Fault 01 / 200 High
Boiler Fault Code Fault 01 / 200
Also written as FAULT01200 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fault 01 / 200 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 computer has lost communication with its control components, meaning it cannot receive or send the signals needed to operate. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the Fault 01 / 200 fix
Source
Information for the Fault 01 / 200 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