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