Replacing v1 thermostat with an v3 extension box

Swansea_Pete1

Hi, I wonder if anyone would know how to replicate the wiring on my v1 thermostat on a v3 extension box. I'm a bit confused as I only seem to have 3 wires!

This was done a few years back by an installer.

This is the back of the extension box.

Thanks for your help in advance.

[Deleted User]

Hello Swansea_Pete1,

Thank you for your question,

It would seem the wire going into H should go into 4. The N and L to their corresponding connectors on the Extension Kit.

However to be absolutely sure, please contact Support and provide the exact make and model of your current thermostat,

https://support.tado.com/en/articles/3590239-how-can-i-contact-tado

Kind regards,

Joey

Whiley1987

Does the circle round the h dictate normally open?