While you wait for answers, we may have found some information which could help you.
Click here for Ariston Combi BoilerI have an Ariston Genus boiler. Fault showing 30 40 50, I can't find manual?
Ariston Microgenus 23 MFFI PCB Defect?
gas boiler keeps going to reset?
What is the problem?
No display on Ariston e-combi approx3yrs old?
Why does my boiler remain ON - even when switch is moved to OFF?