C7 High

Worcester Bosch C7 Fault Code

The Worcester Bosch C7 fault code means: your boiler has switched itself off because it cannot pull enough air through to safely burn the gas, so it will not provide any heat or hot water.. It appears on 2 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Fan problem - Fan not running or No airflow after a defined period of time
Typical repair cost £250-450 (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 C7 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch C7 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