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Hot Water Problem?

When My Heating and Water are on together, the Heating works fine, but the Water only gets warm.
However, if I just put the Water on, the water gets hot as it should do. I have a Potterton Profile 80e. I would really apprecite any help with this problem.
Tony K., September 2009
Thanks Ian, not being very technically minded, where would I locate the said valve, and what would I be looking for ?

Tony K., October 2009
faulty mid position valve?

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