BoilerFaultCodes 289 / CF High
Boiler Fault Code 289 / CF
Also written as 289CF — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 289 / CF 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's internal sensor that detects water pressure has lost its connection or has developed a wiring fault, preventing it from knowing if the system pressure is safe to operate. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 289 / CF fix
Source
Information for the 289 / CF 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