How much does it cost to fix boiler error code overheat lock-out state?

Typical repair cost for the boiler overheat lock-out state fault is £0-120 including labour.

overheat lock-out state High

Boiler Fault Code overheat lock-out state

Also written as OVERHEATLOCKOUTSTATE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code overheat lock-out state appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because it has reached an internally high temperature and needs a manual restart to clear the safety lock. (As reported on Worcester Bosch Highflow 550 CDi)

Pick your boiler brand for the overheat lock-out state fix

Worcester Bosch overheat lock-out state 5 models

Source

Information for the overheat lock-out state 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 27 April 2026