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Potterton Kingfisher MF too hot to test anything?

My Potterton Kingfisher MFboiler seemed to want to heat up continuously, I now have no hot water or heating. I had to turn the whole system off as it was fit to burst, its about 6 years old.
Bev, July 2008
is the boiler stat working?

sonray heating, July 2008
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