How much does it cost to fix boiler error code t6?

Typical repair cost for the boiler t6 fault is £150-300 including labour.

t6 High

Boiler Fault Code t6

Also written as T6 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code t6 appears across 2 boiler brands and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is performing a routine internal safety check on the component that detects the flame, but it has identified a fault in its ability to monitor this safely. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the t6 fix

Ideal t6 1 model Worcester Bosch t6 5 models

Source

Information for the t6 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026