BoilerFaultCodes r1 Low
Boiler Fault Code r1
Also written as R1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code r1 appears across 1 boiler brand and 3 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 resetting its internal settings back to the way they were when it first left the factory. (As reported on Worcester Bosch Greenstar 25HE)
Pick your boiler brand for the r1 fix
Source
Information for the r1 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