While you wait for answers, we may have found some information which could help you.
Click here for Boiler Thermostats Set
No heating or hot water due to low pressure?
how can i fix my sabre he 2.5, green light flickers on and off not staying ?
How can I fix my Sabre 28?
were is the reset button on sabre29he?
Sabre HE 3 second blinking green then flashing red when on?
Sabre boiler keeps switching off?