How to fix my Sabre 24 passing water to the overflow?

I would refer you to a question regarding the Vokera Compact 'Water Drips From Overflow' which I answered. The Sabre is made in the same facotry and shares many of the compnents.

There are several models but a call to Vokera service would help you identify your model,. The data badge is beneath the boiler on the bottom of the chassis base. Give them the number, that's all they would need.

The rest of the answer would be the same.

Bill
July 2015

could be the PRESSURE RELIEF VALVE is passing
normally happens when too much water has been added when topping up the system

Q
June 2015