Boiler Fault Code Overheat Lockout 2/4

Also written as OVERHEATLOCKOUT24 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code Overheat Lockout 2/4 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because the water inside it has become too hot, usually due to low water pressure or trapped air. (As reported on Ideal Logic+ Combi C)