While you wait for answers, we may have found some information which could help you.
Click here for Central Heating Hot Water Boiler
No heating or hot water due to low pressure?
sabre 28?
Why does my Sabre 25HE pcb fuse keeps blowing?
how can i fix my sabre he 2.5, green light flickers on and off not staying ?
How can I fix my Sabre 28?
how to fix sabre he plus?