my water boiler fires up and fires off every 2-3 minutes on a cycle when heating up water.
why does this happen? it is a conventional kingfisher boiler with a cylinder hot water tank.

t, December 2013

I have same problem fewday ago finally reading different post come to know few things as after reseting it start and after a little burst voice comes and it stop again no heating and hot water.
if u look in bottom of boiler one piece of plastic pipe is attached this could b cooper as well in some boiler whos other end left open out side wall or that will b connect with drainage as this pipe take off exast condense water if this pipe is block combi boiler dont start. Need to b some presure thingi to blow up blockage. If u see in bottom of boiler one plastice container whos filled with solid parts of dirt this pipe is attached with one its very easy to take off from side u see a slider hook just push out and it will split half litter of dirty water out need to wash it and place back to its position as it is attached only with two hooks. After doing this urs boiler will b ok. Keep an eye on boiler pressure gauge it should remain between 1 to 2 in normall

Eric, January 2014

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