While you wait for answers, we may have found some information which could help you.
Click here for Could Cause Heating ProblemAriston Microgenus 23 MFFI PCB Defect?
Why does my boiler remain ON - even when switch is moved to OFF?
ariston boiler slow to ignite?
I have an Ariston Genus boiler. Fault showing 30 40 50, I can't find manual?
error code e02 wont work when pressurised?
No display on Ariston e-combi approx3yrs old?