BoilerFaultCodesAriston L.E.D. B Fault Code
Also written as LEDB — same fault.
The Ariston L.E.D. B fault code means: your boiler has failed to light the gas burner properly, meaning it cannot provide heating or hot water until the issue is resolved.. It appears on 11 Ariston models in our database.
Technical description: Ignition Failure: This control signals an ignition failure on the burner 7 seconds after a lighting failure.
DIY fix possible
Check that your gas meter has credit and the gas emergency control valve is in the 'on' positionPress the Reset button on the front of the boiler onceIf the boiler is in a cold location, check if the condensate pipe (outside white plastic pipe) is frozen and thaw with warm water
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ariston models that show the L.E.D. B fault code
Click a model for the full fault code list and model-specific repair notes.
- Challenger 80E Repair: £120-250
- E-Combi One Repair: £120-250
- E-Combi One 30 Repair: £120-250
- Euro Combi 30 MFFI Repair: £120-350
- Euro Prisma 24 Repair: £120-350
- Genus 27 Repair: £120-250
- Genus 30 Plus Repair: £120-250
- Genus One 24 Repair: £120-250
- Genus One 30 Repair: £120-250
- Genus Premium Repair: £120-250
- Microsystem 15 Repair: £120-250
Source
Ariston L.E.D. B fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026