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 5 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.
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Worcester Bosch models that show the 2946 fault code
Click a model for the full fault code list and model-specific repair notes.
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.
- Worcester Bosch Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 2000 manual (PDF)
- Worcester Bosch Greenstar 27CDi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026