Hi Vikwink,
Thanks for reaching out here in the Community. To know more about this issue, I’d like to confirm, where are you located? Do you have a conventional or heat pump system? Have you tried checking our Compatibility checker? If you have a 2nd stage of heating, it will be compatible with the Nest Learning Thermostat 3rd gen.
In case you're interested and you're in the USA, you may visit our Google Store webpage.
Looking forward to your response.
Best,
Emerson
