While you wait for answers, we may have found some information which could help you.
Click here for Combi Boiler Water Pressure Home HeatingSabre boiler keeps switching off?
Sabre 29he plus combi condensing Boiler?
How can I fix my Sabre 28?
Why does my Sabre 25HE pcb fuse keeps blowing?
How to fix my Sabre 24 passing water to the overflow?
Sabre HE 3 second blinking green then flashing red when on?