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Also I have been round the system (so to speak) and the 3 way valve next to the hot water tank feels very hot. Is this normal or could this be the fault. Could it be just sending the water round the radiators instead of into the tank? I'm stuck. Please help

Hi there, we have the danfoss fp715 central heating/ hot water controller connected to our boiler. All has been fine with it until today. This morning when it was set for the hot water to come on the radiators came on instead. I have tried several times to turn the hot water on manually but each...