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Hot water permanently sending on signal from extension kit

Hey my hot water is permanently on at the Tado extension box. Even when I turn it off on the app or room stat it stays on. the only way to turn it off is to shut off the power to the Tado extension kit. I have it wired up as per a standard S Plan heating system so should have independent control over hot water and heating.

I’ve take a video with a multi meter connected to demonstrate the issue . Any ideas welcome.

https://youtu.be/4KYmnNX5z7k

I have contacted Tado tech support but after almost 2 weeks of asking me the same questions they still can’t seem to understand or don’t want to understand the problem.The tech team seem less technically competent than me. and take days to respond.Terrible customer service.
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