by High Performance HVAC | Thermostats |
Thermostat Wiring Colors Code Page Navigation
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- Essential Thermostat Wiring Color Guide Including Manufacturers Instructions
- Thermostat Terminal Designations Quick Guide - Detail Wiring Color Guide Below
- Red-Wire - connects to the R terminal with the red wire
- RC-Wire - connects to the RC terminal RC red
- RH-Wire - connects to RH terminal RH heat
- Y-Wire - connects to the Y terminal and is for cooling stage 1 with the yellow wire
- Y2-Wire - connects to Y2 terminal and is for cooling stage 2
- W-Wire - connects to W terminal and for heat stage 1 with the white wire
- W2-Wire - connects to W2 terminal and for heat stage 2
- G-Wire - connects to G terminal and for fan operation with the green wire
- C-Wire - connects to C terminal (common 24v power) with the C wire
- O or B-Wire - connects to O or B terminal and is for reversing valve operation
- E-Wire - connects to E terminal and is for Emergency heat
- X or Aux-Wire - connects to X terminal and is for auxiliary
- S1 and S2 Wires - connects to S1/S2 terminals and is for outdoor temperature sensor
- Thermostat Wire Color Code Chart
- Tracing the Wire to the Source
- Additional Resources
What you will learn in the
Thermostat Wiring Colors Code article:
- First, what thermostat wire colors is likely to go to which terminal on the thermostat in your heating and cooling system
- Secondly, the function of each wire terminal on the average thermostat highlighting some of the differences in those HVAC system functions from manufacturer to manufacturer as recommended for thermostat wire color
Thermostat Wiring Colors Code | HVAC Control
Always follow the thermostat manufacturer’s instructions whenever changing the thermostat. Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding.
Furthermore, the thermostat wire colors below are the most likely colors used for most installations; however, your thermostat wire colors may be different than what the indication is here. There is no official standard for thermostat wire colors. Additionally, thermostat wiring colors are not standardized. However, these are the most wiring methods used based on my years of experience in the HVAC field, where I successfully wired a lot of thermostats and as recommended by manufacturers and common sense for thermostat wiring colors code.
For instructions on how to wire a thermostat, please see how to wire a thermostat page. Refer back to this page for thermostat wire colors.
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by High Performance HVAC | Air Conditioning |
Helping Your Air Conditioner - Beating the Heat - The new house you just bought is not so cool and the air conditioner seems to run all the time. You begin to worry that maybe something is wrong with the air conditioner. You tolerate it for a while until your spouse broaches the subject a few hours later. Both of you discuss the matter and come to the conclusion that something is wrong with the air conditioner. (more…)
by High Performance HVAC | Thermostats |
What you will learn from the Troubleshooting Broken Thermostats article:
- One of the most common trouble calls for HVAC heating and cooling
- Basic checks of the HVAC System thermostat to see if it is broken or?
- The basics of the thermostat for an HVAC system
- Learn what a heating anticipator is and what type of thermostat uses them.
- Fixing a Broken Thermostat for an HVAC System
- Finally, lots of related useful links to help you learn your heating and cooling HVAC system
Troubleshooting Broken Thermostats - The main connection between the air conditioning and heating system and the end-user is the thermostat. Beyond the air conditioning and heating thermostat, many people know nothing about the HVAC systems that keep them comfortable year-round. While the thermostat may be the problem, make sure you eliminate other possible heating and cooling problems.
(more…)
by High Performance HVAC | Thermostats |
Blank Display on Thermostat Problem - Screen Disappeared - The thermostat display is our interface with our HVAC equipment. The display lets us know what the temperature is in the house. The display tells us what the desired settings are including letting us know the setpoint setting the temperature.
Some displays give us time, and the newer modern displays show us family photos like a screensaver on our computer. But what happens when the display is not there, or there is a blank thermostat display or no display on the thermostat?
Is it a bad thermostat or something else that caused the display to disappear? What do you do when the thermostat screen is not working? (more…)
by High Performance HVAC | Thermostats |
What You Will Learn from this
How to Wire a Thermostat Article:
- the most common trouble call by service and repair HVAC companies
- about thermostat wire with a resource for more information
- the best advice for changing your thermostat
- the most common mistakes made by DIY thermostat changers
- the importance of identifying the type of HVAC system you have so you will select the proper thermostat.
- advisory and disclaimer for installing a new thermostat
- list of tools commonly needed to install a new thermostat
- step by step instructions on changing your thermostat along with hints and tips for making the job easier
- lots of extra links to other articles to make sure you completely understand everything you need to know. (and more about thermostats, thermostat wire, and installing a new thermostat)
- Resource to color codes to make it easier for installation.
- some thermostat wire diagrams at the end of the article
- You can save energy for your heating and cooling system by installing an energy-saving 7-day programmable thermostat or a setback thermostat.
- lots of comments from our readers
- thermostat wiring instructions are good for most low voltage room thermostats including a smart thermostat.
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