Nest gen3 with Vaillant VR33 incompatible signals

[RaduMan]

Dear community, 

I have a Nest Gen 3 learning thermostat working in conjunction with a Vaillant ecoTEC plus VHR NL 35-38/5-5 (model 2020) that came fitted with the OpenTherm module VR33.

It seems that the OpenTherm function is able to modulate the flame level (which is the main function) but it is not able to read and modify the domestic hot water (max) temperature nor the heating circuit (max) water temperature. It shows "equipment control - not connected" in the app where you have the slider for DHW temperature)

This bothers and frustrated me because with the previous boiler Remeha Avanta 35C (model 2009) all these functions were available so I was expecting from a newer boiler to be "smarter".

So, my question is: does anyone have technical expertise on this setup, Nest G3 + OpenTherm + Vaillant VR33 module so I can set up all signals correctly?

P.S. Yes, I have tried Vaillant but they declined the competence towards Nest support...

[moralesvicente]

Hello RaduMan, 

 
Thank you for taking an interest in our community. I understand that you are having questions about compatibility between your boiler and Nest Thermostat 3rd Gen. It’s a pleasure to help you. 
 
Regarding the information that you have provided on this post, my advice is to contact a Nest pro to get professional assistance; they can provide you with detailed information about your concerns. 
 
Regards,
Daniel

[RaduMan]

Thanks Vicente. I think we all know the answer, Nest Learning Thermostat cannot manage Vaillant boiler's water temperature parameters. This brings me to the real question, where I can return the Nest Thermostat for lack of conformity and get my money back according to EU law?

[AxelD]

Hi RaduMan,

Thanks for replying! Sorry to hear that the Nest Thermostat couldn’t manage your Vaillant boiler's water temperature parameters and it wasn’t what you expected.  Please fill out this form and an agent will contact you as soon as possible with further instructions. Remember to add your thread conversation link. 

Let me know once you’ve submitted your form.
 

Regards,

Axel. 

[AxelD]

Hi RaduMan,

We haven’t seen your form submission come through - were you able to access it alright? 

Let us know if you’re running into trouble or still need our help.

Regards,

Axel.  

[RaduMan]

Hi, I have submitted the form

[AxelD]

Hi RaduMan,

Thanks for the confirmation! We've received your form and agent will contact you as soon as possible with further instructions.

Regards,

Axel.