BoilerFaultCodes 70-80 (ll-ll) High
Boiler Fault Code 70-80 (ll-ll)
Also written as 7080LLLL — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 70-80 (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 is failing to light the internal flame needed to heat your water, which means it has safely shut itself down to prevent a gas buildup. (As reported on Ariston Genus 30 Plus)
Pick your boiler brand for the 70-80 (ll-ll) fix
Source
Information for the 70-80 (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