While you wait for answers, we may have found some information which could help you.
Click here for Losing Pressure DayI have an Ariston Clas He system with an error code of 1P2?
gas boiler keeps going to reset?
Why does my boiler remain ON - even when switch is moved to OFF?
ariston boiler slow to ignite?
error code e02 wont work when pressurised?
No display on Ariston e-combi approx3yrs old?