BoilerFaultCodesWorcester Bosch 2946 Fault Code
The Worcester Bosch 2946 fault code means: your boiler's computer memory chip is not being recognised or is mismatched, which prevents the system from starting up.. It appears on 10 Worcester Bosch models in our database.
Technical description: Incorrect code plug detected
What causes the Worcester Bosch 2946 fault?
This fault occurs when the boiler's internal memory chip, which stores the specific settings for your model, fails to communicate with the main control board. The most common reason is that the chip has worked loose, become corrupted by an electrical surge, or was incorrectly installed during a recent repair. Because the boiler no longer knows its own technical specifications, it shuts down as a safety precaution.
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 2946 fault code
Click a model for the full fault code list and model-specific repair notes.
- 1000 Repair: £150-250
- Greenstar 2000 Repair: £150-250
- Greenstar 27CDi Repair: £150-250
- Greenstar 28CDi Repair: £150-250
- Greenstar 4000 Repair: £120-200
- Greenstar 8000 Repair: £150-250
- Greenstar 8000 Life Repair: £150-300
- Greenstar 8000 Life System Repair: £150-250
- Greenstar 8000 Life/Style Repair: £120-280
- Greenstar 8000 Style Repair: £150-250
Source
Worcester Bosch 2946 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