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Ha, put it on a fly lead and connected it to App. I then turned it on from App. It was in off state and so could not be brought to life other than a sequence of switch events or by the App. Works absolutely fine so thanks. Money well spent on device.

Ha, guess what? I fitted device yesterday and the screen remains blank. Not a wiring issue but a faulty device. I tested it just with power connected to a mains fly lead and just a blank screen. Anyway in process of getting a new one - if they offer cash back do you know a suitable device I...

No, that’s it. I had a vision that it was this Nuetral connection that put through. Thanks for the explanation. When I did my degree ( and service later) it was still thermionic valves and just going over to transistors so the brain is getting a bit slow I’m afraid and no idea on these...

It just seems by the circuit diagram that the internal link is to the neutral.

Aaaahg. Looking at the circuit of the new device, when the relay closes it puts a connection to the Neutral wire!!!!!! They way it’s wited now, when relay closes it gives mains Live. ??????? Can you see a solution

I have had an electric floor version of this unit and it was easy to set up and excellent to use. I’ll let you know how I get on. Will be Wednesday before I do it now.

Cheers. We got there in the end. Excellent helpline! How are you funded?

I was viewing this.i guess if it’s wrong way round it shouldn’t cause any issues. Just not work correct and I could change round later. But the circuit diagram I sent you for the device just shows that it’s connected at present to pin 3 ( in thumbnail that is NO)

Just about to connect up but did a double- take on the origional. Isn’t pin 3 for NO ( normally open) as you suggest modern systems are. If so it’s pin 6 on new one not 5.

Thanks. Most helpful.....

So pin 5 is grey wire. NC.... Don’t use link anywhere!! 7 is live and 8 neutral That’s right yes???

Because the link is to the live wire should the mains in wires be swapped over???

So I presume I don’t need the link then??? And thanks again for your help

It’s actually this one. Danfoss RET230VF2 Volt Free & 2 Led Indicators Room Thermostat 087N700801

Thanks for quick response. I sent the photo from the actual installation. I’ll double check the product number when I get in. It shows L and N as you say is simple but it then has a jumper wire from live terminal to pin 2 and the grey wire to pin 3. Pins 1 and 4 not used.

want to remove Danfoss RMT230 and switch to using smart thermostat. Any idea what the 2 and 3 pins connections do. See photo. Using smart device as per instructions on left. It’s a zemismart room thermostat that works with Alexa operating wet underfloor heating servo valve. How the heck...