The C-wire substitution requires you to use the G-wire. When using the G-wire as a common you have to change it to C at the thermostat, and then to a common in the bottom panel of the unit. In your situation, your specific unit uses an older style control board made by White Rogers.

What can I use instead of C wire?

If there is no hidden C-wire, you can use a G-wire instead. However, you will not be able to use your fan independently when the heating or cooling isn’t running. Also, many HVAC systems are incompatible with this solution, including: HVAC systems using electric heat.

How do I install a WIFI thermostat without C wire?





Quote from the video:
Quote from Youtube video: The screws and anchors and the thermostat. We're gonna need a set a screwdriver or a drill. And if you don't have a CE wire. We're gonna use a C wire adapter. Which is gonna give us a C wire.

Is it OK to substitute G wire for C wire?

Quote from the video:
Quote from Youtube video: Option you may know it as a wire that looks like this known as a jumper wire note if you have a jumper wire between our and our C terminals. Next use the supplied. City tags to label each wire.

What if there is no C wire for thermostat?

If your current thermostat didn’t need a C-wire, it (or a wire that can be used as a C-wire) might be rolled up inside the wall. This is more likely to be true if you see all the other color wires present. Line voltage thermsotat scenario: you have just two wires (white and red, probably), and they’re thick.

Is RC the same as C wire?

No the Rc is the red wire. You need 5 wires or more for this to run with all the functions. You can use one of the other wires but you have to drop control of the fan. It will only come on when furnace comes on.

Can you use Google Nest thermostat without C wire?





According to the Nest website, your Nest thermostat will work without a C-wire but specialists still recommend using an adapter if you can’t get a C-wire installed. If your Best thermostat will not receive a constant flow of power, it might not work properly and it runs out of power it will not work at all.

Can I install a WIFI thermostat with only 2 wires?

The Nest Thermostat is not only the best 2 wire wifi thermostat but it is one of the best wifi thermostats you can get for your home. The Nest Generation 3 thermostat can be used with heating only and cooling only systems and requires only wires.

How does C wire adapter work?

A C wire adapter (common wire adapter) is basically a small electronic device, which re-purposes the existing wiring between your thermostat and the furnace, to add a new wire to the system. This new wire will serve as the C wire or common wire to provide the necessary power to the thermostat.

Can I use a Nest Thermostat with only 2 wires?

The Nest Thermostat is compatible with 2 wire low voltage HVAC systems that are either heat only systems or cooling only systems.

Is Nest Thermostat wired or wireless?



wireless

The Nest Thermostat E exclusively uses a wireless Thread connection to Heat Link. There is no way to directly wire it to the Heat Link. This is because the thermostat comes with an integrated stand and isn’t designed to be mounted in place of your old thermostat.

What color is C wire?

Blue wires



Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.