boiler ignites and heating & hot water work for approx 1/2hr and then cuts off.Radiators seem to reach very high temperatures before cut off.

kevin manchester, January 2011

I have a 9.24 worcester boiler (very old) that had a similar problem 5 years ago. Frequent servicing did not fix the problem until one service man figured out that the temperature probes that act as a thermostat were covered in limescale. When he cleaned them....the problem went away.

Hope this helps

CraigS, January 2011