We may have found other answers which could help you.
Click here for Reduce Pressure Boiler
My Main 30HE loses pressure over 24 hour period?
main combi 24he wont stay lit?
How can my boiler be fixed i main Medway 55/54 ?
How can I fix my Main Combi 30HE boiler?
Why does my boiler keep switching on and off?
Main Combo Eco Boiler Error Code E133?