Why Does My Thermostat Have 6 Wires?

What do the letters on thermostat wires mean?

Rh stands for Red-Heat and Rc stands for Red-Cool.

If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat.

Yellow/Y is the AC compressor.

White/W is the Heating element.

Green/G runs the fan..

How many wires should my thermostat have?

Your most basic setup on most modern units needs 4 control wires plus the fifth blue “C” wire that provides power to the thermostat. It won’t cover anything elaborate like a heat pump, but your greatest risk would be the installer uses your wire to pull the wire they actually need.

What is the color code for wiring a thermostat?

Thermostat Wiring Color Code ChartMarkingWire Color CodeDescriptionRcRedPower from cooling, 24 Vac transformerRhRedPower from heat, 24 Vac transformerCBlack/BlueCommon of 24 Vac transformerWWhitePrimary heat cell relay12 more rows

Why does my thermostat only have 2 wires?

If your heating system has only two wires, the job of the thermostat is simple. All it has to do is turn the heat or the cooling on and off. … There is also no thermostat blue wire, or common wire, to power the thermostat, so it has to operate on its own, either using batteries or mechanical temperature detection.

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.

Can I use a Nest thermostat with only 2 wires?

Both the Nest E and Nest Gen 3 Thermostats can be installed with 2 wires. … If you have a heat only system you should connect your thermostat wires to the W terminal and Rh terminals. If you have a cooling only system you should connect your thermostat wires to the Rc and Y terminals.

Do I need 2 Nest thermostats for 2 zones?

The short answer to the questions posed above is: yes. Nest thermostats can certainly be used in conjunction with zoned HVAC systems. However, you are indeed going to require multiple Nest thermostats throughout the house.

What color is the C wire?

BlueThese are the most common colors and the labels used for thermostat wires: Blue or Black – C – The common wire. Red – R – 24 VAC power from the transformer in your furnace.

What happens if you wire a thermostat wrong?

Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself. Dual-fuel systems, a poorly located thermostat, whole-home humidifiers, or incorrect wiring can make the installation of a thermostat a longer, more frustrating, and more complicated …

Where do my thermostat wires go?

The white wire underneath your thermostat connects to your heating system. It terminates at your air handler or furnace. The white wire connects to terminal W in industry-standard thermostats.

Why is there a jumper between R and RC?

Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat.

Does R go to RC or RH?

An R wire can go into a Nest Learning Thermostat’s Rc or Rh connector. … These are not jumper wires, and you can insert the Rc wire into the Rc connector and the Rh wire into the Rh connector.

What are the 5 thermostat wires?

Here is the industry standard thermostat wire color code used for most systems:White. The white wire connects to your heat.Yellow. The yellow wire connects to your compressor.Green. The green wire connects to the fan.Orange. This wire connects to your heat pump (if applicable).Red (C). … Red (H). … Blue.

What is a 2 wire thermostat?

If we put it simply, a 2 wire thermostat is one which has only 2 wires coming out of its backside. … When it comes to low voltage systems, a 2 wire thermostat is usually known as a “heat only thermostat” and is used for systems like a gas furnace (with only heating option).