BoilerFaultCodesWorcester Bosch 2.C Fault Code
Also written as 2C — same fault.
The Worcester Bosch 2.C fault code means: your boiler is currently running an automated sequence to remove trapped air from the system, which typically occurs after you first turn the power on or restart the unit.. It appears on 1 Worcester Bosch model in our database.
Technical description: Air purge mode
What causes the Worcester Bosch 2.C fault?
This code appears because air has been detected within the boiler's internal heat exchanger or pipework, often following a period of inactivity or after the system has been drained and refilled. To protect the components from overheating, the boiler automatically enters a cycle to vent this trapped air. It is a protective measure rather than a breakdown, ensuring the water can circulate freely and safely through the appliance.
This is most common in autumn when homeowners turn their heating back on for the first time or after radiators have been bled in preparation for winter.
DIY fix possible
Wait for approximately 8 to 15 minutes for the automated cycle to complete naturally.Check that your radiator valves are open to help move air through the system.Monitor the boiler display; once the code disappears, normal operation should resume automatically.
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Gas Safe Register →Worcester Bosch models that show the 2.C fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2.C 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