While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating Combi
can I fit this myself or do I need to be gas safe engineer?
Why does my boiler keep switching on and off?
My Main 30HE loses pressure over 24 hour period?
Fault on fan or flue?
Main Combo Eco Boiler Error Code E133?
How can I fix my Main Combi 30HE boiler?