What is the G wire on a thermostat?

G-wire – Fan, usually green. Y-wire – Cooling, usually yellow. W-wire – Heat, usually white.

What does G mean on Nest?

* Fan relay (G) is optional. However, without a G wire, Nest will not be able to control the fan independent of heating. † Common wire (C) not required in most cases, but strongly recommended. ‡ Use Rh or Rc in single transformer systems; no jumper wire required.

What are W1 and W2 wires?

In a conventional system, W/W1 controls your heating system and, where applicable, W2 controls your heating system’s second stage, which helps warm the home faster.

Where does the blue wire go on nest?

If your thermostat doesn’t have a separate connector labeled C and you’re not sure what type of system you have:

A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat.
If the B wire is blue, it should most likely be connected to the C connector.

What does it mean when Nest says no power to Rh wire?

To fix an E74 error or no power to the Rh wire error on your Nest thermostat, check for loose connections and fix them. If that does not work, clean out the drain pipes and check if the condensate pump associated with your HVAC is clogged.

What color is W2 wire?

White
White for W Terminal. W2 – This is the thermostat terminal used for second stage heat.

What kind of wiring diagram do I Need?

This page is dedicated to Wiring Diagrams that can hopefully get you through a difficult wiring task or just to learn some basics in how to wire a 2-way switch, 3-way switch, 4-way switch, outlet or entertainment component diagrams.

What are the sub symbols in a wiring diagram?

Switch – A switch in an electrical wiring diagram includes sub-symbols such as a push-to-break switch, push-to-make switch, 2-way switch, DPST switch, DPDT switch, etc. Battery – A battery represents more than one cell to indicate electrical energy. Moreover, it works on constant voltage.

How are black and white wires wire nutted together?

The white wires are wire nutted together so they can continue the circuit. Just use your mouse pointer on this diagram and follow the current flow from black wire (hot wire) through the 2-way switch, then to the load and return through the white wire (neutral).

How is ground wire connected to light switch?

Take notice of the ground wire. It’s very important that the ground or bare copper wire is connected to the green screws on the switches. All grounds are connected, and the ground is connected at the light when possible. If no connection is available, then attach the ground wire to the box in a solid way.

What kind of electrical circuit has no ground wire?

In Carson Dunlop Associates’ sketch at left the wire circuits shown at upper right and lower right are both two-wire electrical circuits where no ground wire is present. At right in the photo is the type of electrical receptacle to use on two-wire (no ground) circuits.

What is a typical GM starting system wiring diagram?

Click on the image here to pull up a PDF of a typical GM starting system wiring diagram. Depending on the year, model and engine of your GM vehicle, your starting system may be less complicated or use only some of the components shown here. For example, earlier anti-theft systems didn’t communicate the same way with the PCM.

Why do people ask for a car wiring diagram?

Every day in every auto repair forum I see people ask for a car wiring diagram. It’s really an impossible request. It shows the poster doesn’t understand how car makers design their wiring diagrams and they assume that the wiring diagrams are the same for each engine in that model year.