While you wait for answers, we may have found some information which could help you.
Click here for Boiler Fault Comingerror code e02 wont work when pressurised?
gas boiler keeps going to reset?
I have an Ariston Clas He system with an error code of 1P2?
Ariston Microgenus 23 MFFI PCB Defect?
What is the problem?
Why does my boiler remain ON - even when switch is moved to OFF?