I kind of thought that might be the case!! I was looking for ideas of what might ne the problem really, so my I could try to fix it. I don't have a manual, can you advise where I can get one from please?
What controls are we talking about? I do have the central heating on high and the water heater on high too. The problem is that it keeps on boiling even after the water temperature appears to have gotten to the required temperature. How can I remedy this?