6-t2 High

Worcester Bosch 6-t2 Fault Code

Also written as 6T2 — same fault.

The Worcester Bosch 6-t2 fault code means: your boiler's fan is running continuously even though the heating is not trying to start, which is often caused by a communication error between the internal computer and the fan motor.. It appears on 1 Worcester Bosch model 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: Permanent fan operation: 0...100% Fan running without gas supply or ignition.
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 6-t2 fault code

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

Source

Worcester Bosch 6-t2 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