BoilerFaultCodesWorcester Bosch 2920 Fault Code
The Worcester Bosch 2920 fault code means: your boiler has detected a problem with how it tracks its own flame, causing it to shut down for safety purposes.. It appears on 5 Worcester Bosch models in our database.
Technical description: Fault in flame monitoring
What causes the Worcester Bosch 2920 fault?
This fault occurs when the boiler's internal computer is unable to verify that a flame is present, even if the burner has ignited correctly. It is usually caused by a dirty or corroded sensor that can no longer send a clear signal back to the control board, or a fault within the wiring and electronics that manage safety checks. Consequently, the boiler shuts down because it cannot confirm it is operating safely.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the 2920 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2920 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 2000 manual (PDF)
- Worcester Bosch Greenstar 27CDi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026