While you wait for answers, we may have found some information which could help you.
Click here for Boiler Ignite ReplacedSabre 29he plus combi condensing Boiler?
Sabre he will not work with combustion cover on?
Sabre boiler keeps switching off?
Why does my Sabre 25HE pcb fuse keeps blowing?
sabre 28?
How to fix my Sabre 24 passing water to the overflow?