BoilerFaultCodes EH 258 High
Boiler Fault Code EH 258
Also written as EH258 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code EH 258 appears across 1 boiler brand and 4 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 developed a serious communication fault or hardware failure, meaning it can no longer control the heating process safely. (As reported on Worcester Bosch Greenstar 30i)
Pick your boiler brand for the EH 258 fix
Source
Information for the EH 258 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