While you wait for answers, we may have found some information which could help you.
Click here for Boiler Hot Turning Taperror code e02 wont work when pressurised?
ariston boiler slow to ignite?
Ariston Microgenus 23 MFFI PCB Defect?
Error light blinking (orange colour) on Ariston e-combi boiler?
Why does my boiler remain ON - even when switch is moved to OFF?
gas boiler keeps going to reset?