Additional L wire

[EdR]

Third generation Nest with a Waterfurnace Premier 4.0 Geothermal system.  Hooked up the new Nest.  But was left with one wire not connected anywhere.  It was a black "L" wire.  Not sure what to do with it.  Tucked it in the wall for now.  I did enter it on the compatiablity chart and it never noted to use it.

My unit is three stage Heat, two stage cool.

Heat -  does have emergency heat and auxillary heat.  Just real worried that the black line should of been used, any advice would be wonderful.

[Kristina1119]

Heat pumps with L wires

• L wires are typically used to show system status, like emergency heat being on. Nest thermostats can work with systems that use Service Light (L) wires. While L wires can't be connected to the Nest thermostat, it doesn't need them. The Nest thermostat and Nest app will show you system status information without connecting L wires.

[EdwardT]

Hi folks,

@Kristina1119, thanks for the help!

@EdR, how's it going with your Nest Thermostat? Let us know if you have other questions and we'd be glad to help.

Thanks,

Edward

[MelbaDT]

Hey EdR, 

Checking back in — we hope you've got the answer you're looking for. Feel free to let us know if you have further questions in mind. 

Best, 

Melba

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba