While you wait for answers, we may have found some information which could help you.
Click here for Combi Boiler Domestic Water HeatingI have an Ariston Clas He system with an error code of 1P2?
Ariston Microgenus 23 MFFI PCB Defect?
Error light blinking (orange colour) on Ariston e-combi boiler?
What is the problem?
Why does my boiler remain ON - even when switch is moved to OFF?
error code e02 wont work when pressurised?