While you wait for answers, we may have found some information which could help you.
Click here for Boiler Moved Aristonariston boiler slow to ignite?
Why does my boiler remain ON - even when switch is moved to OFF?
What is the problem?
gas boiler keeps going to reset?
Ariston Microgenus 23 MFFI PCB Defect?
error code e02 wont work when pressurised?