Boiler Fault Code Overheat LED flashing

Also written as OVERHEATLEDFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Overheat LED flashing appears across 1 boiler brand and 2 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 detected an unsafe temperature level, likely due to a blockage in the water flow or a faulty temperature sensor. (As reported on Heatline Capriz 25 System)