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...