6-tA High

Worcester Bosch 6-tA Fault Code

Also written as 6TA — same fault.

The Worcester Bosch 6-tA fault code means: your boiler is having trouble detecting the flame it needs to stay lit, which is preventing the system from heating your home or water.. 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: Ionisation oscillator: OFF/ON.
Typical repair cost £120-280 (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-tA fault code

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

Source

Worcester Bosch 6-tA 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