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 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's computer has encountered a serious internal error and cannot communicate with its internal parts, meaning the system will remain off until it is reset or repaired. (As reported on Worcester Bosch Greenstar 12i System)
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 27 April 2026