How do you wire a 4 wire thermostat?

4 Wire Thermostat Wiring Color CodeRed Wire = Rh = Power.White Wire = W = Heating Wire.Yellow Wire = Y = Cooling Wire.Green Wire = G = Fan Wire.Blue Wire = Y = Cooling.Jun 12, 2019

What do the colors of the 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 do I know what wire to get for my thermostat?

Look for connectors that have labels that are the same as your thermostat. For instance, you might find labels like R, W, G, Y, C or O/B. You should find wires attached to these connectors that are the same color as the wires that connect to your thermostat.

How do you check thermostat wires?

1:395:57How to Test a Thermostat with a Multimeter! - YouTubeYouTube

What happens if thermostat wires touch?

The thermostat closes the circuit between the wires when it calls for heat, because the 24 volts that are fed to it are from a special thermostat relay. You didnt hurt anything when you touched the wires together.

How do you check thermostat wires with a multimeter?

1:395:57How to Test a Thermostat with a Multimeter! - YouTubeYouTube

How do I know if C wire is live?

It is easy to see if you already have a c-wire connected to your system. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter “c.” If this terminal has a wire attached to it, you have an active “c-wire.”

How do you check if a thermostat is working?

Check the screen: Check the screen of the thermostat and make sure that it is lighted. A blank or unlighted screen could indicate a thermostat failure. Check the batteries: Many modern thermostats rely on battery power to operate. If the screen is blank or unlighted, a battery change could solve the problem.