While you wait for answers, we may have found some information which could help you.
Click here for Problem Ariston Hoterror code e02 wont work when pressurised?
Ariston Microgenus 23 MFFI PCB Defect?
Why does my boiler remain ON - even when switch is moved to OFF?
gas boiler keeps going to reset?
I have an Ariston Clas He system with an error code of 1P2?
Error light blinking (orange colour) on Ariston e-combi boiler?