Honeywell ct50k1002 to nest with no c wire

[Iceleck]

From gas fireplace

 to Honeywell

 

 not sure why all 4 wires are hooked up but can I use one of these as a C wire?

Both TH wires are hooked into the R.

Both TP-TH wires are hooked into the W

[EdwardT]

Hi Iceleck,

Thanks for reaching out. I'd love to know more about this. Could you share the make and model of your HVAC system? You can also click on this link to learn more about the systems that are compatible with the Nest Thermostat.

Thanks,

Edward

[EdwardT]

Hi Iceleck,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do.

Thanks,

Edward

[EdwardT]

Hi Iceleck,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward