While you wait for answers, we may have found some information which could help you.
Click here for Heating Rise SystemI have an Ariston Clas He system with an error code of 1P2?
I have error code 108 on my Ariston Combi boiler what do I do to fix it?
Ariston Microgenus 23 MFFI PCB Defect?
Why does my boiler remain ON - even when switch is moved to OFF?
Error light blinking (orange colour) on Ariston e-combi boiler?
No display on Ariston e-combi approx3yrs old?