Replacing the Honeywell CM707 that has only two wires

DeePallavi

Hi,

I have just bought a tado smart thermostat + starter kit + Valve radiators. while going through installation videos i have got confused as all of the videos are showing either having 3/4 wires or N L L A B C type of wiring. My home wiring seems to be simpler, on further reading i understood that this one is a heating only furnace (excuse me if i am getting the terminology wrong).

I have two questions;

1. Is the Tado Suitable for such a wiring
2. If Yes, then how should the wiring look when i install the Tado.

I am attaching pictures of my set up, and the tado for reference.

CM707:

[Deleted User]

Hello @DeePallavi,

Thank you for your request.

Please contact our technical support via the chat on our website (tado.com) with the exact make and model of your boiler/current thermostat, so they can help you with the wiring.

Best regards,

Your tado° Team

DeePallavi

I went through the installation as per the step by step instructions and i must say it was pretty easy, even for a novice like me.

Tado was perfectly suitable for my set up, the onscreen installation guide is very detailed

The ‘B’ wire in my original set up went to ‘NO’ in tado
The ‘A’ wire in my original set up went to ‘COM’ in tado.

Dont forget to switch off the boiler and remove the fuse / power breaker.

AshokM

I have the same thermostat with 2 wires to be replaced with tado. I tried a few combinations but it didn’t work.
I have the wired tado that does heating and hot water. Home setup is separate hot water controller along with two zones for room heating - both with separate Honeywell cm707 timers.
I am able to replace the hot water controller With tado that had 4 wires but the other two room thermostats only have 2 wires.
Looks like I need help…

Questions:
1. With my setup, how many tado thermostats do I need ?
2. For multi zone, will tado have to continue keeping them separate ? ( one for downstairs and another for bedrooms)
3. For the room thermostats, how should I do the wiring ? Appears that the lady on this thread managed to make it work.

I’ll send a picture of mine.