BoilerFaultCodesWorcester Bosch EH (258) Fault Code
Also written as EH258 — same fault.
The Worcester Bosch EH (258) fault code means: 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.. It appears on 11 Worcester Bosch models in our database.
Technical description: Internal error
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the EH (258) fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £280-£550
- 26 CDi Xtra Repair: £280-550
- 30i Junior Repair: £280-450
- 35 RSF Repair: £280-450
- Danesmoor Repair: £250-£550
- Greenstar 12i System Repair: £250-450
- Greenstar i Repair: £250-450
- Heatslave Repair: £280-550
- Hideaway Repair: £280-550
- Junior 24i Repair: £250-£480
- Junior 28i Repair: £280-550
Source
Worcester Bosch EH (258) fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026