The boiler has started to cut in an out far more frequently than before.

Turning the temperature contol up or down (on the boiler) stop it for a while, but them I assume the system reaches temperture and in clicks in an out rapidly again.

Is there a part I can easily replace?

Boiler is about 5 years old

I am loolking to extend house soon which will require the boiler to be replaced so I want to do something to get me through the winter.

Steve J, December 2010