central heating is turned on when hot water is turned on

central heating is turned on when hot water is turned on. why? I am expecting the CH will remain off and the HW is on

Answers

  • Impossible to be sure since there are many possibles, and many variables. There is nothing here about your system configuration; whether it's a combi boiler, tanked hot water system or other. Much more info. needed.

  • Thanks for your reply. Mine one is S-Plan. Finally I find out the issue. It was the cable issue. There was one cable it should connect to HW NC. If you just follow the Tado instructions, it will be wrong. I double check the cables in the photo i took my pervious controller. I figured it out.