Why Does My Thermostat Have 5 Wires

Connect the thermostat to the baseplate. The Nest Thermostat E only has an R connector which is typically where an R wire would go.

5 Wires But Not Connected To Common Ecobee

The three wires are red white and blue or yellow depending on the manufacturer.

Why does my thermostat have 5 wires. Even though Ecobee does not require a c-wire you still need to have a 4-wire thermostat cable because they require a power. Six-wire thermostats are commonly seen with heating systems that have two stages of heat and one stage of air conditioning. Your most basic setup on most modern units needs 4 control wires plus the fifth blue C wire that provides power to the thermostat.

The simplest way to avoid work and complications is to find a thermostat that does not require a common wire. The heating system will likely be a gas or electric furnace. Configure the thermostat following the manufacturers settings.

In rare cases a wire may be in the wrong thermostat connector which can cause your system to malfunction. Bob shows you how to upgrade from a four wi. I have a Sensi Wifi thermostat that does not require a 5th common wire and it does a great job.

Youll also have to change the wire at the furnace from G to C. An R wire can go into a Nest Learning Thermostats Rc or Rh connector. Our older thermostat has only four wires.

If the temperature set is not reached after a particular amount of time the furnace will ramp up to a higher output of heat and will run at this. The OB wire can have many configurations. If you have separate heating and air conditioning systems you might have separate Rh and Rc wires that come out of the wall and are connected to your system.

A thermostat with five wires typically controls an air conditioner with a heating system. In most cases you should see about 5 wires. A two-stage heat system means that when the thermostat calls for heat the furnace will turn on using the low setting first.

Most thermostats have a Red wire that is the power wire that usually connects to R RC terminals of the thermostat a Green wire that energizes the Fan relay connected to the G terminal on the thermostat a Yellow wire that energizes the outdoor units contactor if you have air conditioning and a white wire that. My old thermostat that Im replacing has 6 wires labled W O G R C Y O was light red color C was brown. The new thermastat I bought is a Honeywell RTH6350D.

Lets take a look at the G wire. Option 4 Use a Thermostat That Does Not Require a C-wire. If they are connected incorrectly the thermostat can burn out.

Make sure that your thermostat is correctly wired into the circuit board and that none of the wires have been corroded are damaged or have been chewed into by pests. Red is the universal color indicating a hot wire. If you do not have 5 wires then you will either have to run new 5 wire cable or get another thermostat that can run off batteries and does not require the common connection.

If you have a C wire place it into the C terminal on your wall plate. However depending on the system model and features of your particular system this number can range anywhere from 3 to 8. For the Y Y1 and Y2 wires Y or Y1 will go to the Y terminal and Y2 will go to the Y2 terminal.

This wire will go to the G terminal on your new thermostat. It wont 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. The wiring for the heat pump on page 25 does not explain what to do with the C or O wire.

These are not jumper. In some cases youll need to check your systems control board to accurately identify. What are the 5 wire thermostats.

To replace a three-wire thermostat connect each of the three wires to the right connection. One of the biggest complaints or rather reasons for confusion I have come across is down to the fact that many thermostats on the market dont work if your system isnt. When replacing a three-wire thermostat connect this.

If after checking all of the items on this checklist your thermostat still has no power youll probably want to call a professional and have them take a look at the problem. Generally speaking a thermostat that controls only heat in your home will have two wires and one that also controls air conditioning must have at least three or four wires. Most people dont use the fan only mode so while youd give up control over the fan in the system youd gain constant power to the smart thermostat.

The main trouble is dealing with those different colored wires knowing which one does what and if that wasnt enough you also have numbers and letters to deal with. Why does my thermostat have 5 wires Best Smart Thermostats that Dont Require a C Wire Android Central 2021 Many of the best smart thermostats require a C wire common wire to power it due to their LED displays and Wi-Fi-powered advanced functions leading homeowners with older heating systems to look for smart thermostats without a C wire requirement. The thermostat is likely a digital thermostat that requires the C-Wire or the common wire to provide power for the thermostat.

If your system also includes ventilation or a heat pump the thermostat can have as many as seven wires. What are the Wire Colors for a Thermostat At this point you should have a certain number of wires sticking out. Bob installs a smart thermostat which requires a five wire connection.

One popular option is the Ecobee Thermostat.

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