While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating Hot WorksAriston Microgenus 23 MFFI PCB Defect?
error code e02 wont work when pressurised?
Error light blinking (orange colour) on Ariston e-combi boiler?
ariston boiler slow to ignite?
gas boiler keeps going to reset?
I have an Ariston Clas He system with an error code of 1P2?