BoilerFaultCodesWorcester Bosch 2948 Fault Code
The Worcester Bosch 2948 fault code means: your boiler is struggling to stay lit when it is running at its lowest power level, often causing it to shut down for safety.. It appears on 10 Worcester Bosch models in our database.
Technical description: No flame signal with low output
What causes the Worcester Bosch 2948 fault?
This fault occurs when the boiler's internal sensor can no longer detect a steady flame while the unit is operating at its quietest, most efficient setting. The most common reason is that the sensing probe has become dirty or worn out, though it can also be caused by the gas valve failing to deliver a consistent flow of fuel at low pressures.
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 2948 fault code
Click a model for the full fault code list and model-specific repair notes.
- 1000 Repair: £150-300
- Greenstar 2000 Repair: £150-300
- Greenstar 27CDi Repair: £150-300
- Greenstar 28CDi Repair: £150-300
- Greenstar 4000 Repair: £120-250
- Greenstar 8000 Repair: £150-300
- Greenstar 8000 Life Repair: £180-350
- Greenstar 8000 Life System Repair: £150-300
- Greenstar 8000 Life/Style Repair: £120-280
- Greenstar 8000 Style Repair: £180-350
Source
Worcester Bosch 2948 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