BoilerFaultCodesWorcester Bosch 2963 Fault Code
The Worcester Bosch 2963 fault code means: your boiler has detected that the sensors monitoring its internal temperature are giving incorrect readings or have failed, causing the system to shut down for safety.. It appears on 10 Worcester Bosch models in our database.
Technical description: The heat exchanger sensor or both supply and heat exchanger sensors are defect
What causes the Worcester Bosch 2963 fault?
This fault occurs when the boiler's control board receives conflicting or impossible temperature data from the internal sensors that monitor the main heat exchanger. This usually happens because a sensor has developed an internal electrical fault or the wiring connecting it to the main computer has become loose or corroded. To prevent the unit from overheating, the system shuts down immediately because it can no longer safely track how hot the water is getting.
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 2963 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: £150-250
- Greenstar 8000 Repair: £150-250
- Greenstar 8000 Life Repair: £150-250
- Greenstar 8000 Life System Repair: £180-350
- Greenstar 8000 Life/Style Repair: £140-£240
- Greenstar 8000 Style Repair: £150-250
Source
Worcester Bosch 2963 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