BoilerFaultCodesWorcester Bosch 228 Fault Code
The Worcester Bosch 228 fault code means: your boiler thinks a flame is burning even though it hasn't actually sparked or started, causing it to shut down for safety.. It appears on 10 Worcester Bosch models in our database.
Technical description: Flame signal without flame present
What causes the Worcester Bosch 228 fault?
This fault occurs when the boiler's internal sensors mistakenly detect a flame signal while the burner should be off. The most common reason is a faulty or contaminated sensing electrode that is sending a false electrical signal to the control board, preventing the boiler from starting for safety reasons.
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 228 fault code
Click a model for the full fault code list and model-specific repair notes.
- 1000 Repair: £150-300
- Greenstar 2000 Repair: £150-300
- Greenstar 27CDi Repair: £150-300
- Greenstar 28CDi Repair: £150-300
- Greenstar 4000 Repair: £150-300
- Greenstar 8000 Repair: £150-300
- Greenstar 8000 Life Repair: £150-350
- Greenstar 8000 Life System Repair: £150-350
- Greenstar 8000 Life/Style Repair: £120-£280
- Greenstar 8000 Style Repair: £150-350
Source
Worcester Bosch 228 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