Quick Answer: What Is Y Wire On Thermostat?

What do thermostat wires mean?

Your Rh and W terminals control your heat.

The C and Rc terminals are what powers the thermostat.

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..

Does R go to RC or RH?

Here are some general guidelines: 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.

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.

What happens if you wire thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

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 is the difference between y1 and y2 on a thermostat?

In conventional cooling systems, Y/Y1 controls the first stage of cooling and Y2 controls the second stage, which helps cool down the home faster. In heat pump systems, Y1 controls your compressor, which heats and cools your home.

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 color is the Y wire on a thermostat?

yellowThe yellow wires connect to the Y terminals on your thermostat.

What is Y y2 on thermostat?

Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit). Y2 wires apply only if you have two air conditioner compressor units running from one AC thermostat.

How do I know if my thermostat wire is bad?

4 signs your thermostat is badSign #1: Your thermostat has no power or is unresponsive. … Sign #2: Your heater or A/C won’t turn ON. … Sign #3: Your A/C or heater runs constantly and won’t turn OFF. … Sign #4: Room temperature and setting don’t match. … Step #1: Make sure thermostat is on the right setting.More items…•

Why does my thermostat only have 3 wires?

If you have a heat-only system, you may notice that your thermostat has three wires—R, G, and W. In this scenario, the Power Extender Kit (PEK) is not compatible. 1) Run an additional wire to use as a C from the furnace control board to the thermostat. …

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.