Tado Won’t Turn On Hot Water

I have a tado system for a while. Yesterday I ran out of hot water as the tado is not turning on the hot water according to the schedule. It turns on the heating ok.

Issue seemed to have stared after the smart thermostat needed new batteries. I put new ones in and it’s all connected. Have rebooted the extension kit too.

Any ideas as I am desperate to get some hot water back!