While you wait for answers, we may have found some information which could help you.
Click here for Boiler System Adderror code e02 wont work when pressurised?
Why does my boiler remain ON - even when switch is moved to OFF?
boiler keeps going out?
No display on Ariston e-combi approx3yrs old?
I have an Ariston Genus boiler. Fault showing 30 40 50, I can't find manual?
What is the problem?