How much does it cost to fix boiler error code OVERHEAT LOCKOUT?

Typical repair cost for the boiler OVERHEAT LOCKOUT fault is £100-280 including labour.

OVERHEAT LOCKOUT High

Boiler Fault Code OVERHEAT LOCKOUT

Also written as OVERHEATLOCKOUT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code OVERHEAT LOCKOUT appears across 5 boiler brands and 29 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 become too hot internally, usually because there isn't enough water moving through the system to cool it down. (As reported on Ideal Vogue Max System)

Pick your boiler brand for the OVERHEAT LOCKOUT fix

Baxi OVERHEAT LOCKOUT 3 models Ideal OVERHEAT LOCKOUT 12 models Johnson Starley OVERHEAT LOCKOUT 2 models Keston OVERHEAT LOCKOUT 6 models Potterton OVERHEAT LOCKOUT 6 models

Source

Information for the OVERHEAT LOCKOUT 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