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My Potterton Suprima 50 keeps fires then immediately cuts out?

It worked fine before i went away for three weeks. Now i've come back i can't get any hot water at all and only twice have i managed to get the heating on by pressing the reset button.
I've checked there's water in the water in the tanks in the loft and they are fine.
I'm a novice in these things so any jelp would be greatly appreciated.
Many thanks
Andy, April 2012
Change over heat and temp sensor ,easy to change push fit take gently out to replace

ltd, April 2012
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