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Potterton EP2001?

We have a Potterton EP2001 controller for our boiler. Since switching the heating back on we cannot control the heating independently of the hot water, meaning the hot water is always on! This did not happen before, any reason for it happening now? Thanks.
Stephen, November 2009
It's posible it's not a clock fault. If the clock appears to be working ok, then it might be a motorized valve is faulty and keeping the boiler on.

jg, November 2009
link Click here to see other fixes for Potterton EP2001.