While you wait for answers, we may have found some information which could help you.
Click here for Combi Boiler Heating Fault
How can my boiler be fixed i main Medway 55/54 ?
main combi 24he wont stay lit?
can I fit this myself or do I need to be gas safe engineer?
How can I reduce the pressure on my boiler?
Fault on fan or flue?
Main 24 Combie Boiler causing power trip of all power to home?