You will need a C wire for the Nest to keep battery powered.
Can you go to the heating system and post pics of where the thermostat wires connect on that end so we can determine if you have a place to connect a C wire.
The C common needs to come from the transformer on the heating system so without seeing if there is a common terminal at the heater no way to know if you can connect one.
If you cannot access the equipment then only other option is to use a 24V transformer that plugs into the wall near the thermostat but then you will see the wire going up the wall to the Nest unless you want to try and snake it behind the sheetrock.
I wanted to check in and see if you managed to see Houptee's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.
I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.
I am glad to be of help. Please let me know if you have any other questions from here, as I would be happy to take a closer look. Please be aware that I will be locking the thread soon as well.
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.
