The Efficient Home Forum

Hi, I am having exactly the same problem. System works fine for the first 8 months, then we notice that the water is too hot. I have done some further investigations with the aid of a separate temperature probe placed next to the CS92a sensor. What I found was that rather than updating the Evohome ...

I have recently installed a Evohome system to control my existing S Plan. I have two BDR91s for CH and HW, and HR92 radiator controllers in four zones. All seems to working perfectly ..... up to a point.
What I now find is that the CH BDR91 is switching on when there is no demand causing the boiler ...