BoilerFaultCodesWorcester Bosch E9 224 Fault Code
Also written as E9224 — same fault.
The Worcester Bosch E9 224 fault code means: your boiler has switched itself off because it has detected an unsafe temperature or a blockage in the exhaust flue, preventing it from operating safely.. It appears on 13 Worcester Bosch models in our database.
Technical description: Flue or high limit thermostat activated (safety circuit)
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 E9 224 fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £120-£350
- 26 CDi Xtra Repair: £120-£350
- 30i Junior Repair: £120-280
- 35 RSF Repair: £120-280
- Danesmoor Repair: £120-£350
- Greenstar 12i System Repair: £150-350
- Greenstar 12i System Repair: £150-350
- Greenstar CDi Compact Repair: £150-300
- Greenstar i Repair: £150-300
- Heatslave Repair: £120-£280
- Hideaway Repair: £120-£280
- Junior 24i Repair: £120-£350
- Junior 28i Repair: £120-280
Source
Worcester Bosch E9 224 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