While you wait for answers, we may have found some information which could help you.
Click here for Main Hot ColdFault on fan or flue?
Can I get the instructions to add more water to boiler pressure is just bel?
how to regulate gas?
Why does my boiler keep switching on and off?
can I fit this myself or do I need to be gas safe engineer?
Main Combo Eco Boiler Error Code E133?