We may have found other answers which could help you.
Click here for Boiler Heating Combi
My Main 30HE loses pressure over 24 hour period?
Main 24 Combie Boiler causing power trip of all power to home?
how to regulate gas?
How can my boiler be fixed i main Medway 55/54 ?
can I fit this myself or do I need to be gas safe engineer?
How can I reduce the pressure on my boiler?