We may have found other answers which could help you.
Click here for Replaced Making Loud
Sabre HE 3 second blinking green then flashing red when on?
how to fix sabre he plus?
How can I fix my Sabre 28?
Why does my Sabre 25HE pcb fuse keeps blowing?
No heating or hot water due to low pressure?
Sabre he will not work with combustion cover on?