Hot Water..... Where has it gone?

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Installed a 3+ system onto my S plan system four days ago and all worked fine. Was able to control my heating and hot water on the app. This morning the Hot water icon has gone and also the receiver units hot water button does nothing ? I have no means of heating my water anymore. I raised a case but no response from Tado yet. If they don’t get back to me soon I’ll have to unwire it and go back to my nest system so we have hot water.