BoilerFaultCodes Yellow L.E.D. H Emergency
Boiler Fault Code Yellow L.E.D. H
Also written as YELLOWLEDH — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Yellow L.E.D. H appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that fumes are not being properly vented outside, so it has safely shut itself down to prevent a carbon monoxide hazard. (As reported on Ariston Egis 24 MFFI)
Pick your boiler brand for the Yellow L.E.D. H fix
Source
Information for the Yellow L.E.D. H 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