Boiler Fault Code 50-60-80 (ll-ll-ll)

Also written as 506080LLLLLL — same fault.

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

Fault code 50-60-80 (ll-ll-ll) appears across 1 boiler brand 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 lost its ability to measure the temperature of the water used for your radiators, so it has shut down as a precaution to prevent overheating. (As reported on Ariston Clas HE 24)