BoilerFaultCodesWorcester Bosch 2964 Fault Code
The Worcester Bosch 2964 fault code means: your boiler is struggling to pump water through its internal system effectively, which is likely preventing it from producing heat or hot water.. It appears on 9 Worcester Bosch models in our database.
Technical description: Flow rate in heat exchanger too low
What causes the Worcester Bosch 2964 fault?
Circulation fault
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 2964 fault code
Click a model for the full fault code list and model-specific repair notes.
- 1000 Repair: £150-350
- Greenstar 2000 Repair: £150-350
- Greenstar 27CDi Repair: £150-350
- Greenstar 28CDi Repair: £150-350
- Greenstar 4000 Repair: £150-350
- Greenstar 8000 Repair: £150-350
- Greenstar 8000 Life Repair: £150-350
- Greenstar 8000 Life System Repair: £180-350
- Greenstar 8000 Style Repair: £150-350
Source
Worcester Bosch 2964 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