As with most questions its a case of analysing what is happening
1;is the water in the boiler bubbling/boiling
2;is the water coming out of boiler very hot compared to whats going in
The first thing I would check is the pump,is it on speed 3
then I would see if sufficient water was flowing through boiler,there are many reasons for your boiler doing what it is so you need to study what is going on
toptrish
January 2014