We may have found other answers which could help you.
Click here for Pressure Relief Valve HeatingAlpha cb 24 boiler drain question?
Alpha InTec 28x?
alpha he cb25 boiler has no flame how do i fix this?
How to repressurise an alpha hecb25 boiler?
boiler wont fire up?
How can I fix my Alpha CB24X Combi Boiler?