Vaillant Ecotec Pro 28 + WiFi Thermostat

[uniQ]

Hi,

I purchased the following thermostat: BHT-002 because the heating timer on the front of the boiler stopped working:

https://www.krieger-therm.ch/downloads/bht-002-with-wifi.pdf

My boiler connections look like this:

Do I connect the dry contact (1+2) from the thermostat to RT?

Thanks

 

[ianmcd]

yes and discard the link, you say your internal boiler clock stopped working, you will have to link the switch wires from the timer out for your new thermostat to work, it may work if you just set it to constantly on, if not you will have to bridge it out

 

[uniQ]

yes and discard the link, you say your internal boiler clock stopped working, you will have to link the switch wires from the timer out for your new thermostat to work, it may work if you just set it to constantly on, if not you will have to bridge it out

I just tried wired everything together and it worked, connected the thermostat to wifi and tested it, it was turning my heating on and off etc.
So then I took it all off, to wire the thermostat and everything correctly to the wall etc, but now my boiler is on S.39 - which according to the manual means: S.39 Contact thermostat triggered The surface-mounted thermostat or the condensate pump has triggered..

Any help?

 

[uniQ]

edit, fixed it.

 

[Jajodu]

What did you do to fix it?