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how can i fix my ep2002 controller?

i have an potterton ep2002 controller,that appears to be working fine,lights clock etc, but my central heating will only kick in while the boiler fires up to heat the water,even though the controls for both are set to constant.Is the controller faulty or is it some other problem any ideas?
bayfsplace, October 2009
thanks Ian I'll take a look cheers!!

bayfsplace, October 2009
faulty motorised valve

Ian, October 2009
link Click here to see other fixes for Potterton EP2002.