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heating still on!?

I ve got a potterton suprima 30 with EP2002 control panel. The HW slide is set to timed and the CH slide is set to off, got plenty of hot water but i am still getting the heating come on. any help greatly appreciated!!
dan, October 2009
i had the same problem rectified by replacing the 3 way valve

strayduck, October 2009
link Click here to see other fixes for Potterton.