The previous thermostat is a CARRIER, TB-PAC01-A Programmable Air Conditioning Thermostat. Heat feature that has kicked in on a couple occasions in the past year automatically. Then the thermostat body is screwed in place. The simplest setup for a heating system is a two-wire thermostat. To understand the problem, I will describe the previous thermostat and the current thermostat that I want to install. If I hook up the matching colours I can get everything except my heat on, which with it being October I’d love to get it running. Here is a link to a good Honeywell thermostat installation YouTube video: https://www.youtube.com/watch?v=c_ZDrNeeG94 I hope you can figure it out. Most of the new thermostats require a 5th common wire. The white wire in the heat strips is normally W1 and attached to the W1 or W on the thermostat. Hi Mark! If the thermostat does not require a C common wire (the neutral side of the transformer) then you could just use the 2 wires. Most of the time R to Y controls the outdoor AC contactor. Steve. Hi Mark! A technician came to replace a TXV valve and he switched the wire to the AUX terminal instead. The other compressor wire goes to the ‘Y’ terminal. I have the following situation: I have a single stage Heat Pump. When I turned the braker back on and turned the switch on the thermostat to “Heat” the heat will go and keeps going even when the temperature went passed the set point. The thermostat instructions call for a red power wire, a yellow, green, and white wire. If you have any questions please let me know. The Y connection on the thermostat is what controls the contactor on the outdoor air conditioning unit. I was about to replace my thermostat and found that the yellow wire was connected to the “y” post on the thermostat, but it is connected to the “c” post on the control board on the furnace. It looks like you have everything pretty much wired right other than I would think you would need to leave the R and Rc wires jumped and the “O” orange wire controls the reversing valve. I believe the thermostat was about $140. Steve, My current thermostat doesn’t have a C wire and I want to replace it with a wifi thermostat that needs a C wire. I hope the thermostat works well for you. With 6 wires it sounds like you have a heat pump. The model number for our Sensi thermostat is 1F86U-42WF. Steve, I recently switched my thermostat with the nest. So the thermostat was wired up at the factory, but then the plumber installed the boiler onsite (good old fashioned burner/boiler for forced hot water baseboard heating—no air conditioning, heat pump, etc.). What does that mean? I hope you can easily find and solve the problem. firstname.lastname@example.org Thanks! If this is hooked up wrong it could burn up the thermostat and many low voltage controls. Usually the W (white wire) controls the (electric heat) or gas valve and the Y wire (yellow) usually controls the outdoor heat pump or air conditioning unit. I am so sorry, but this is too complex for me to comment. Whether you need furnace ignitors, AprilAire filters, EZ Flex filters, or another kind of HVAC merchandise, we want to serve you. Step by step instructions on how to replace a Thermostat for LG DLE3733W No heat or not enough heat … Hi Matt! I will follow your directions faithfully. There should be instructions that came with your new thermostat that explain how to change the “O/B” terminal to energize the reversing valve in the heating mode if you have a Rheem or Ruud unit. I hope you can get the wiring figured out and corrected. We purchased it from Home Depot and it does not require the C wire to run. I have no idea why the green wire is attached to Y2 on the thermostat. I hope that you find an easy inexpensive solution. Just trying to figure out where that bridge went to. Steve, This Shawn I have question new unit I got heat strips that unit has black wire blue wire white wire green and red then from ac outside has yellow and blue were do these go on thermostat, Hi! If I advise you wrong I could burn up many of your controls and cause lots of damage. The thermostat is like a light switch and switches on and off between the red power wire and other wires on the thermostat. Steve. I have a honeywell TH1110DV1009 thermostat. White controls the heat on the W terminal and Yellow controls the outdoor unit’s contactor to make the AC come on and is on the Y terminal. Who knows. Oh, and then I tried to put the old one back on and it didn’t work! Steve. Rule of thumb colors for the wires are: R (red) power wire from the hot side of the furnace’s transformer. After taping with electrical tape I would recommend stuffing it back behind the thermostat out of the way of other wires. Many times contractors will run 8 to 10 wire thermostat cable and there are 3 or 4 extra wires that will not be connected to anything. 1-16 of 289 results for "2 wire heat only thermostat" Skip to main search results Eligible for Free Shipping. Do you have any idea what is happening here? Most of the time you will need to use a jumper between R and RC so the air conditioner will work. the old thermostat has a R and Y hook up and so does the new one. The white wire that goes out to you AC that is attached to “C” on your furnace’s control board is the C (common) wire and you would need that to run the Ecobee thermostat if the Ecobee requires a “C” common wire connection. Red to red and the current thermostat that is for thumb ” on the thermostat is what i see the. Heat element in the air conditioner is a CARRIER, TB-PAC01-A programmable air thermostat... And have run into issues with the Nest thermostats and i have a separate boiler for heat connected. 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