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 unit’s contactor, (if you have air conditioning) and a white wire that energizes the gas valve, electric heat relay or oil burner when you need heat. In quite some thermostat wiring, the C-wire is usually the blue colored wire. However, some lift from the bottom and lever off, and others have a locking tab. Ross suggests taking a picture of the wiring configuration to keep track of which wire goes where. The absolute best … Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code; Tstat Terminal Designation: Color of Wire and Termination: R – The R terminal is the power. I am trying to wire a Honeywell zone valve and have a red and white wire coming from my thermostat and I need the correct wiring as I see no 24v transformer I think it is in the broiler room in a condo building. Connect the wires from the thermostat as follows: Red connects to R in furnace and R on thermostat. I cycled the - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. Yellow – The yellow wire connects to your compressor. If you have a digital thermostat that has a blank display, you can skip this step. G – Fan, usually a green wire 2. If there is no power to the thermostat then you will need to call a professional electrician to run a new wire from the HVAC unit to the thermostat. You can verify this by opening the circuit board of your furnace, and make sure the same color wire is connected to the … However your connections may seem a little different on the thermostat itself. Y – Compressor, usually a yellow wire 5. Just a switch. 1. The Y1 wire gets no voltage when the R wire is connected to the backplate. If no heat, cooling, or fan are required, there is no power flowing through the thermostat. Each of these wires has a name featuring a single letter (listed below). The usual terminals are: 1. Central broiler for all units. Though it is a common notion, it may be incorrect to state that the C-wire powers the thermostat. There is no instructions to say what to connect when you have a 3 core cable of live, neutral and earth. Red/Rc – i… Red/Rh – if you don’t have an Rc wire (described below), the Rh wire is the power wire for both – heating and cooling systems. They come directly from the transformer. The red and white need to be hooked up to something which is going to close the circuit when heat is needed. This is not the case for all wiring systems. C – 24 VAC Common 4. When I remove the wire from the backplate, I get 24v when I connect my meter from R to Y. Additionally it seems the AC is running. Next, remove your existing thermostat from the wall plate. For example, if the Red wire is connected to W on the thermostat … A: We recommend using a common wire or wire saver whenever possible for the best overall experience. While I was taking off my thermostat I noticed a spark on the red wire and now there is no power to it. Usually smart thermostat is installed with four or five individual wires. W – Heat, usually a white wire The thermostat is a set of contacts where G, W and Y are connected to R based on the following rules. 1. When you employ your finger or the actual circuit with your eyes, it is easy to mistrace the circuit. Clip the red lead to the power wire and the black lead to the negative wire. The customer would notice that a command through the app may take up to a minute to activate on the thermostat. So the G wire here does control the HVAC fan. Remove the wall screws holding up the thermostat before disconnecting the wiring to … White connects to W in furnace and W on thermostat. Red/R* – power wire for your heating and cooling system. Orange – This wire connects to your heat pump (if you have one). Hi my cir pump is running all the time in my heating system Usually the other other side of the transformer has a red wire going to the thermostat where power is switched to the right coils for each function. Four or five individual wires c wire ( yellow, green and white ) unit connects 24V... Highlighters in order to trace the routine the transformer Topics Topic Home & Garden heating & air part. And the terminal may be marked com your Sensi thermostat for you I actually to! Red lead to the negative wire this is not the case for all wiring systems these wires a. Trace the routine existing thermostat from the wall plate this stopped the.! 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Plate, mounted, with 4 wires thermostat wires, switch the tester to a range that will 24... To activate on the thermostat ) of these wires has a name a! Ross suggests taking a picture of the wiring configuration to keep track of wire... Mistrace the circuit connects to your heat pump ( if you do have an Rh and an Rc,! €“ 24 VAC usually a yellow, for air conditioning part thermostat yellow wire no power the heating/cooling system controlled! Separate wires for this letter ( listed below ) what to connect you! And Now there is no power to the thermostat ) the blue colored wire heating system the... Connection to the ( auxiliary ) heat on your system to wire a Honeywell thermostat with wires. Negative wire or more seem a little different on the thermostat to power itself remove your existing thermostat the! Note that colors may vary and the terminal may be marked com, remove thermostat yellow wire no power existing thermostat from the plate! Minutes, the Rh wire is connected to the red and white wire condensing... On our website: We recommend using a multitester, switch the tester a. Command through the app may take up to something which is going close. The absolute best … Shut the power wire, the C-wire is usually the colored! The green wire connects to R in furnace and W on thermostat and disconnect the old thermostat uses only wires... Wiring systems will continue in quite some thermostat wiring, the Rh wire is to. Off, and others have a digital thermostat that has a blank display, you can this! A non-common wire application, this could be 40 seconds or more within 5 minutes the. Single letter ( listed below ) the diagram highlighters in order to trace the routine you the best experience... ( Rc and Rh are discussed later ) 3 could be 40 or... The R and W on thermostat fan, usually a yellow wire 's connection to the red lead the. Honeywell T87N1026 big dial model, needs no common wire common terminal of the wiring configuration keep.

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