Nest E connecting with 2 wire

[Codiacc]

Hello guys and girls 

Well I am going a little crazy because I can't get nest to work 

So I have only 2 wires for my electric boiler when they are connected boiler starts to heat water.

I have looked a whole lot of videos but couldn't find solution 

I put external 24v adapter for power but nest says it doesn't find connected wires.... 

https://1drv.ms/i/s!Alm_rW2HprCujIwQDw-AXsz9xCpJzQ

Brown is + from boiler blue is - from boiler

Black is + from 24v adapter and black white is minus

Tryed to change inputs but no result 

What I need to do to make it work 

Tnx for all info 

Br 

[Patrick_Caezza]

@Codiacc 

You have the Google Nest Thermostat (2020), not the Nest Thermostat E.

The fact that the wires are stranded and not solid makes me wonder if you have a line voltage (120V) system And not a 24V system.

The Google Nest Thermostat(2020) is not designed to directly connect to an external 24vac transformer. You need to use the Nest Power Connector with the external transformer.

First, you need to use a multimeter to check for voltage on the boiler's + and—terminals.

[Codiacc]

@Patrick_Caezza

Thank you for reply 

I checked lines from boiler with multimeter and it shows 24v

Can you tell me how to connect wires withnest power connector and  external transformer? 

[Patrick_Caezza]

@Codiacc 

Here you go.