While you wait for answers, we may have found some information which could help you.
Click here for Problem Lights Fineerror code e02 wont work when pressurised?
Ariston Microgenus 23 MFFI PCB Defect?
ariston boiler slow to ignite?
I have an Ariston Clas He system with an error code of 1P2?
No display on Ariston e-combi approx3yrs old?
Error light blinking (orange colour) on Ariston e-combi boiler?