How much does it cost to fix boiler error code 6.A?

Typical repair cost for the boiler 6.A fault is £120-250 including labour.

6.A High

Boiler Fault Code 6.A

Also written as 6A — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 6.A appears across 2 boiler brands and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has recorded a previous error that has triggered a lockout, meaning the unit is currently preventing itself from starting to protect the system. (As reported on Worcester Bosch Greenstar 25 HE Combi)

Pick your boiler brand for the 6.A fix

Ideal 6.A 1 model Worcester Bosch 6.A 3 models

Source

Information for the 6.A 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 7 July 2026