Learning Thermostat not working correctly with W and Rc wiring

[PaulM921]

I set the unit up and ran a test with no issues. When heating system turns off the clicking at my furnace continues until the heat is turned back on. Concerned this can cause damage. Old thermostat works perfectly. Any suggestions?

[Patrick_Caezza]

@PaulM921 

All smart thermostats will not work correctly with a 2-wire heat-only system. The Nest Learning Thermostat, 3rd Gen, is no different.

Basically, you need to add a C wire, and the easiest way is to use a Google Nest Power Connector wired like this.

[Jenelyn_O]

Hi there,

Thanks for reaching out. I hope you get the answer you're looking for. Please let us know if you still have questions or concerns, so we can further assist  you.

I appreciate your help, @Patrick_Caezza.

Best,

Jenelyn

[Markjosephp]

Hello PaulM921,

I'm checking back in — how's it going? Still need our help?

Regards,

Mark

[Jenelyn_O]

Hi PaulM921,

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'll be locking this thread in 24 hours.

I appreciate your help, Mark.

Thanks,

Jenelyn