Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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What are the 5 wires used for connecting to home thermostat?

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Yellow- air conditioning. White- heating. Green- blower fan. Red- 24 volt power . Blue- common wire not always used on battery thermostats.

Posted on Jan 20, 2013

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Need help understanding how to wire a new programmeable thermostat. I currently have a White Rodgers 1F73 model (non-programmeable) connected. I am confused with the instructions on how to connect the...


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Dec 20, 2014 | Honeywell Heating & Cooling

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Installed a rth6350 now no power


The RTH6350 is a battery-powered thermostat. Did you correctly install the AA batteries? Press down and pull the battery holder away from the thermostat on the right hand side. Try new batteries. Did you remember to secure the C wire with a wire nut and push it back into the wall. It should not be connected to the thermostat.

If you connected the C wire, you may have damaged the thermostat by providing too much current. Honeywell has the documentation for the RTH6350 on the product page: http://yourhome.honeywell.com/home/Products/Thermostats/5-2-Day-Programmable/RTH6350D.htm . The installation guide is here: https://customer.honeywell.com/request.cfm?form=69-2416ES . See page 23 and subsequent pages for the wiring diagrams.

I hope this helps.

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1 Answer

I HAVE A HONEYWELL MANUAL THERMOSTAT NO BATTERIES ALL IT HAS ON THE BACK IS T8400C 1099 (2) 0710 1B HELP, IT DOES NOT SHOW ANY THING THE SCREEN IS BLANK


This model of Honeywell thermostat uses the 24v from the unit to power it. One of three things must have happened.

1. You have lost power to the furnace, therefore no power to thermostat.
2. You only have 4 wires hooked up on the thermostat and not 5. A lot of older homes had just 4 wire running to the thermostat, which will not work for this thermostat. You should have a wire connected to the (C) or (B) terminal on the thermostat, which ever one they have, I can't remember off hand. These are the Common terminals. They have to have the common from the furnace 24v power to operate.
3. Faulty thermostat, which will obviously have to be replaced.

Hope this helps and gets you to cooler days!

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Have an Intertherm thermostate in mobile home controlling gas hearing and elec ac. Blue wire to thermostat connects to the "A" terminal on the thermostat...Blue wire goes to a terminal on the...


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I installed my RTH2310b honeywell, and called tech support because my old thermo had two connections, and none were labled. I have a gas furnace and hot water heat in a 1911 era home. Sop the guy I could...


Was there a jumper wire from the Rc connection to the Rh connection? And did you remove it? If you did you will need to re-install that jumper wire. You will need to use the jumper wire when you have a older furnace with just two wires. Verify that information with the instruction manual that came with the thermostat. And make sure that you always disconnect the power for the furnace before working on or changing the thermostat wires because it uses 24volts and you could shock yourself(24 volts stings a little) and or short out the voltage regulator for the furnace. Also some older furnaces require a thermostat with a "heat anticipator" setting and may cause a problem with the furnace if a compatible thermostat is not installed.

Nov 11, 2009 | Honeywell Electronic Programmable...

1 Answer

Installing thermostat - extra wire?


you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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Nov 01, 2009 | Honeywell Electronic Programmable...

1 Answer

My heater is blowing air all the time not blowing warm air even when the thermostat is off.


Go to Home Depot and get a new thermostat.  Take some pictures with your digital camera of the color wire connections on your old thermostat and then hook them up the same to your new thermostat using the pictures as a guide.

Oct 24, 2009 | Heating & Cooling

1 Answer

Replacing a Williamson (White Rogers) Termostat


rh is power for cooling terminal and rh is power for heating terminal connect red wire to rc or rh and there should be a jumper between rc and rh if not install one all other wires are color coded correctly. now the blue wire is not used.

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What is the blue hooked up to now?

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Changing out home heating and cooling thermostat


Yes, the blue or yellow are interchangeable. they are for the cooling mode. Just first make sure the white is heat, green is fan and red is the power 24v.

Dec 17, 2007 | Honeywell CT87B ROUND HEATING&COOLING...

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