BoilerFaultCodesWorcester Bosch 2946 V Fault Code
Also written as 2946V — same fault.
The Worcester Bosch 2946 V fault code means: your boiler's internal computer chip is either missing or has failed, meaning the system doesn't know which specific model it's supposed to be.. It appears on 12 Worcester Bosch models in our database.
Technical description: Incorrect code plug detected – the code plug needs replacing
What causes the Worcester Bosch 2946 V fault?
This fault occurs when the boiler's memory chip, which holds the specific instructions for your model, is either damaged or has become loose. Without this physical plug being correctly identified by the control board, the boiler cannot safely operate and will shut down to prevent damage. The most common reason is a hardware failure within the plug itself or a communication error starting in the main circuit board.
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 V fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £120-£220
- 26 CDi Xtra Repair: £120-220
- 30i Junior Repair: £120-£250
- 35 RSF Repair: £120-240
- Danesmoor Repair: £120-£220
- Greenstar 2000 Repair: £120-250
- Greenstar 8000 Life System Repair: £150-250
- Greenstar 8000 Life/Style Repair: £120-£220
- Heatslave Repair: £90-180
- Hideaway Repair: £120-£250
- Junior 24i Repair: £120-£250
- Junior 28i Repair: £120-£250
Source
Worcester Bosch 2946 V 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