How much does it cost to fix Worcester Bosch error code Air flow fault?

Typical repair cost for the Worcester Bosch Air flow fault fault is £150-350 including labour.

Air flow fault Emergency

Worcester Bosch Air flow fault Fault Code

Q: What does the Worcester Bosch Air flow fault fault code mean?

Your boiler is failing to clear combustion fumes properly and has automatically shut down to keep your home safe.

Also written as AIRFLOWFAULT — same fault.

The Worcester Bosch Air flow fault fault code means: your boiler is failing to clear combustion fumes properly and has automatically shut down to keep your home safe.. It appears on 1 Worcester Bosch model in our database.

Technical description: The fault indicator will flash (approximately five times per second). The controls fail to detect the correct air flow and the electricity supply to the gas valve is interrupted.

Typical repair cost £150-350 (including labour)

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.

24si II Repair: £150-350

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 27 April 2026