BoilerFaultCodesWorcester Bosch 2950 B Fault Code
Also written as 2950B — same fault.
The Worcester Bosch 2950 B fault code means: your boiler is trying to light itself but cannot detect a flame, meaning your heating and hot water will likely stop working.. It appears on 11 Worcester Bosch models in our database.
Technical description: No flame signal. Following starting procedure the burner starts automatically. After cleaning set the correct gas / air ratio correctly
What causes the Worcester Bosch 2950 B fault?
This fault occurs when the boiler's internal computer tries to start the combustion process but cannot confirm that a flame has actually been lit. The most common reasons are a build-up of carbon on the sensing probes or a component failure that prevents gas from flowing correctly into the burner.
This fault is more common during the first few cold spells of autumn, as components that have been idle over summer can struggle to operate or may have become blocked by debris.
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 2950 B fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £120-300
- 26 CDi Xtra Repair: £120-350
- 30i Junior Repair: £120-280
- 35 RSF Repair: £100-280
- Danesmoor Repair: £120-280
- Greenstar 8000 Life System Repair: £150-350
- Greenstar 8000 Life/Style Repair: £120-350
- Heatslave Repair: £120-280
- Hideaway Repair: £120-280
- Junior 24i Repair: £100-250
- Junior 28i Repair: £120-350
Source
Worcester Bosch 2950 B 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