BoilerFaultCodesWorcester Bosch Air flow fault Fault Code
Also written as AIRFLOWFAULT — same fault.
The Worcester Bosch Air flow fault fault code means: your boiler is struggling to clear air fumes properly, so it has safely shut down to prevent any unsafe conditions.. It appears on 2 Worcester Bosch models in our database.
Technical description: The domestic water demand indicator will flash (approximately five times per second).
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 Air flow fault fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Air flow fault 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 7 July 2026