If your current thermostat has a wire in the c terminal.
Nest thermostat e installation without c wire.
The nest thermostat e is simple to set up and install.
The nest app won t tell you to connect one do not connect a c wire to your nest thermostat unless the nest app tells you to.
Remove any jumper wires.
The sensi wi fi smart programmable thermostat 1f86u 42wf works very well without a c wire.
Use the compatibility checker.
Custom wiring diagram that you will need to install your nest thermostat.
The wiring diagram that you ll get from the nest app will tell you to connect the c wire to your nest thermostat.
The nest thermostat e works with most 24v systems including forced air variable speed heat pump and radiant systems as well as.
Other thermostats like the ecobee come with an adapter that can be used if you already have four wires but no common wire ecobee thermostats are also discussed below.
For instance the nest thermostat and the nest e thermostat can usually run without a common wire see below for more information.
If you do not have a c wire don t worry.
I m going to install the nest e thermostat but want to add a third wire to serve as a c wire.
These illustrations use the 3rd gen nest learning thermostat but the steps are the same for the nest thermostat e.
If that s the case you can install one pay to have one installed or simply grab.
If your current thermostat doesn t have a wire in the c terminal.
Begin installation with the app the nest app s step by step instructions make it easy to install and wire your thermostat so use it as your main guide.
The nest learning 2 nd generation also claims to be able to work without a c wire as it borrows the power from the d and g wire.
You don t need a c wire take your fan wire and wire it to c on the nest then move fan from the furnace controll.
How to tell if you have a c wire.
We ll walk you through the entire process of installing your thermostat in the right spot and you ll f.
I have an older boiler system with two wires running from the aquastat to the old thermostat.