While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating Reset
My Main 30HE loses pressure over 24 hour period?
how to regulate gas?
main combi 24he wont stay lit?
How can I fix my Main Combi 30HE boiler?
Can I get the instructions to add more water to boiler pressure is just bel?
Fault on fan or flue?