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Connection of Nest thermostat to a Vaillant boiler and a circulator for underfloor heating

benben80
Community Member

‎04-06-2025 10:07 AM

Hello,
My heating engineer has connected the Nest thermostat to the heating system only on the circulator.
How should I proceed to ensure that the Nest thermostat is connected to both the boiler and the circulator for the underfloor heating?

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virnab
Community Specialist
Community Specialist

‎04-09-2025 05:04 PM - edited ‎04-09-2025 05:20 PM

Hi benben80,

 

Thanks for reaching out to our community.

I appreciate your inquiry about the way to ensure that your Google Nest thermostat is connected to your boiler and the circulator for your underfloor heating.

Before I start further troubleshooting, let me ask you a few questions:

  • Could you please confirm what the model of your Google Nest thermostat is? 
  • What country are you located in?
  • Are you using a high-voltage system?
  • What is the type and model of your HVAC system?

In addition to this information, I would appreciate it if you could provide a picture of the wiring connected to the control board. (The control board is typically located inside your HVAC system or boiler.)

Please keep me posted.

 

Best regards,

Virna

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