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Thermostat Wire Colors Code | HVAC Control


What you will learn in this article:
1) What thermostat wire color is likely to go to which terminal on the thermostat
2) The function of each wire terminal on the average thermostat highlighting some of the differences in those functions from manufacturer to manufacturer

Thermostat Wire Colors Code | HVAC Control

Thermostat Wire Colors CodeThermostat Wire Colors Code – Always follow the thermostat manufacturers 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. The thermostat wire colors below are the most likely colors used for most installations however your thermostat wire colors may be different than what is indicated here. There is no official standard for thermostat wire colors. Thermostat wiring colors are not standardized but 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.

For instructions on how to wire a thermostat please see our how to wire a thermostat page.


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Minisplit Ductless Heat Pumps Air Conditioners


Minisplit Ductless Heat Pumps Air Conditioners

Why Do I Need a MiniSplit Ductless Heat Pump or Air Conditioner?

Minisplit Ductless Heat Pumps Air Conditioners

There are many people who can actually save money by installing a minisplit ductless air conditioner or heat pump over installing the conventional ducted split system air conditioner or heat pump. A few of the possible areas where some can use a minisplit ductless heat pump or air conditioner are rooms over the garage where additional heating and cooling is necessary simply because rooms over garages suffer because garages in most homes are not as insulated as is other parts of the home. This usually creates problems with many of the newer homes because I have seen builders who need a lesson in load calculation and properly sizing the air conditioning or heat pump systems for the conditions. I am sure many people will agree especially people who own homes where there is a room over the garage. How many of those people have supplemental heating and cooling by the way of a window unit or portable heater? Many people I would say from my observations over the years. Now these people can benefit from the easy installation including lower installation costs of the minisplit ductless heat pump or air conditioner. Other places where minisplit ductless units can be considered for installation are additions to homes and basements where minisplit ductless units are great for dehumidification.


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Troubleshooting Broken Thermostats | HVAC Control


Troubleshooting Broken Thermostats

Troubleshooting Broken Thermostats

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 their systems that keep them comfortable year round. There comes a time when the thermostat has a problem or the end user wants to replace the thermostat because they think it is a broken thermostat. It is not uncommon for a person to call an HVAC contractor and tell the secretary that they think the thermostat is broken because their air conditioner or heating system does not work. In some instances this is the case while in others the thermostat is not broken but something is wrong with the air conditioning and heating equipment that needs to be repaired. In either case it is usually best to call an HVAC professional to look at the problem especially if you want to replace the thermostat. There are a few things you can check with your thermostat before you call an HVAC professional. A little thermostat troubleshooting is in order.


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Blank Display on Thermostat Problem – Screen Disappeared


Blank Display on Thermostat Problem - bad tstat

Blank Display on Thermostat Problem

The thermostat display is our interface with our HVAC equipment. The display lets us know what the temperature is in the house and tells us what the settings are for the heating and cooling equipment including letting us know the set point setting for the temperature. Some displays give us the 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 thermostat? Is it a bad thermostat or something else that caused the display to disappear?


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How to Wire a Thermostat | HVAC Control


How to Wire a Thermostat

What You Will Learn from this Article:
1) the most common trouble call by service and repair HVAC companies
2) about thermostat wire with a resource for more information
3) the best advice for changing your thermostat
4) the most common mistakes made by DIY thermostat changers
5) the importance of identifying the type of HVAC system you have so you will select the proper thermostat
selecting the proper thermostat resource
6) advisory and disclaimer for installing a new thermostat
7) list of tools commonly needed to install a new thermostat
8) step by step instructions on changing your thermostat along with hints and tips for making the job easier
9) 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
10) some thermostat wire diagrams at the end of the article

Your thermostat or programmable thermostat is an integral part of your comfort system.

how to wire a thermostat

TouchScreen Thermostat

These thermostats, whichever type of thermostat or thermostats you have, require little maintenance. Often, I find that the only thing people know about their AC and Heating systems is how to turn the thermostat on and off and change the temperature setting. The purpose of this site is to help people go beyond the thermostat and learn more about their system as a whole, not just a dial on the wall that adjusts the temperature when they are not comfortable. However, we’ll delve into the world of thermostats on this page and hopefully this will help many people.

Types of HVAC Thermostats Article (opens in a new window)


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