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I am not sure if you are being sarcastic or not with your suggestion regards the motorised valve? Do you think this could be the problem? I had to replace my ep2002 regardless of this problem anyway because one of the slider switches was faulty and did not always work.

Okay I have a strange problem...if anyone can help that would be great!! I have a Potterton6002 timer controller and a Potterton Profile boiler. Here's how to produce the problem: 1) Put the HW on (either via timer or on constant) 2) Put the CH onto constant 3) Put CH to off But, the...