BoilerFaultCodes 40-60 (ll-ll) High
Boiler Fault Code 40-60 (ll-ll)
Also written as 4060LLLL — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 40-60 (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 the internal connection needed to communicate with its controls, which usually indicates an electrical fault or a blown fuse inside the boiler casing. (As reported on Ariston Genus 30 Plus)
Pick your boiler brand for the 40-60 (ll-ll) fix
Source
Information for the 40-60 (ll-ll) 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