We may have found other answers which could help you.
Click here for Boiler Circuit Fault
can I fit this myself or do I need to be gas safe engineer?
My Main 30HE loses pressure over 24 hour period?
How can I reduce the pressure on my boiler?
How can I fix my Main Combi 30HE boiler?
Main Combo Eco Boiler Error Code E133?
Main 24 Combie Boiler causing power trip of all power to home?