BoilerFaultCodesWorcester Bosch 229 Fault Code
The Worcester Bosch 229 fault code means: your boiler started to heat up but the flame went out unexpectedly, causing the system to shut down for safety.. It appears on 8 Worcester Bosch models in our database.
Technical description: Flame failed during burner operation
What causes the Worcester Bosch 229 fault?
This fault occurs when the boiler's control system loses the signal that a flame is present while it is supposed to be firing. The most common reasons are a dirty or worn sensor that can no longer 'see' the flame, or an unstable gas supply that causes the flame to flicker and go out. It can also be triggered if the burner is struggling to breathe due to a blocked flue or a build-up of debris inside the heat exchanger.
This fault is more common in winter, as extreme cold can cause the condensate pipe to freeze, backing up water into the boiler and extinguishing the flame.
DIY fix possible
Check if other gas appliances (like a hob) are working to confirm gas supplyEnsure your gas meter has credit if you use a pre-payment meterCheck that the condensate pipe (the plastic pipe leading outside) isn't frozen if it is very cold
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Gas Safe Register →Worcester Bosch models that show the 229 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 229 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