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Old thermostat only has a red and white wire - Heating & Cooling

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What is your question? Red and white is normal for heat systems. I guess your point is your new thermostat doesn't tell you what to do with only red and white wires?

Posted on Dec 24, 2016

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I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

Jul 31, 2015 | Heating & Cooling

1 Answer

I upgraded my thermostat to a digital one. when i removedd the old one only the red and white wires were used. i also replaced the thermostat wires. i hooked up all the wires according to color red to r,...


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As your unit had just 2 wires, Red and White, you had just heat only with no AC and no fan on as described as you have no green circuit wired up at the furnace or thermostat, you can add a relay if not equipped but that would make your unit very old.

Oct 19, 2013 | Heating & Cooling

1 Answer

Hi! We have a really old williamson thermostat (not sure about the model but it says t87fi89i 2 8047 [dont know if it's i or 1 either]). We want to replace it with a honeywell t87n east-to-see thermostat....


On most applications for heating the red and white wires are used,however I would check what wires are connected to terminals on old thermostat. These connectons should be labled with initial of wire color,such as R,W,G,Y or Rc. If your green wire is hooked to R or whatever just hook new thermostat up like the old one and you should be ok. Hope this helps. Thanks.

Nov 12, 2010 | Honeywell Electronic Programmable...

2 Answers

Justgot a honeywell rct8100 thermostats and cant gerthe wireing rigt i only havered and white wire coming out of old thermostat


Hi,
On the new thermostat put the red wire under the Rh terminal and the white wire under the W terminal. If you heat does not work then it is because something else is wrong, not the wiring...

heatman101

Mar 30, 2010 | Honeywell Electronic Programmable...

1 Answer

Replacing thermostat what to do with single red wirew/bridge?


yes u leave the bridge intact and just put ur red wire to r or rc and usually they say rh and rc that is for a 2 transformer system which obviously u dont have so leave the wire intact jumped and hook ur red wire up yellow is ur ac wire white is ur heat wire and green is ur fan wire and red is ur 24 volt hot wire all a tstat does is jump that red wire to white for heat green for fan or yellow for ac but make sure ur power to ur unit is off before u change wires or u risk touching wires together and burning up transformer

Feb 24, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have the honeywelL RTH111 and also had an old thermostat with only two wires...... the manual says to just hook the wires to the same letter slots as it was in the old thermostat..... i did so but the...


Hook up the red wire to Rh (or Rc if they are jumped together) amd the white wire on W.

For thermostat terminal designation
R - 24 V power in
W - 24 V out to heat circuit
Y - 24 V out to cooling circuit
G - Fan relay

Hope this helps

Jan 21, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Programmable thermostat


I am unsure of your question, but if you are just replacing your old thermostat with a new one, then connect the red wire to the Rh or R terminal and the white wire to the W terminal on the thermostat. Hope this helps

Jan 09, 2010 | Honeywell Electronic Programmable...

1 Answer

I had an old two wire system, red and white. gas


Check for a bad thermostat and wire by jumping the red and white wire together at the thermostat. If the unit fires, you have a bad thermostat. If it does not, jump the R and W terminals at the furnace (or where ever the thermostat wires are connected to). If the unit fires you have a bad wire. If it still does not fire, you have an issue with the heating system not the thermostat or its wires.

Dec 06, 2009 | Honeywell Focus 6300B 5-2 Days...

1 Answer

Wiring


red goes to RC and RH, White goes to W, Green goes to G and Blue goes to Y. iam assuming on the old tstat that Red whent to R White went to W Green went to G and Blue went to Y

Sep 20, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

My honeywell ct87K thermostat will not turn the heater on


On your thermostat - R is the power in terminal. Y is the cooling out. W is the heating out. (G is fan out). It does not matter which wire goes to R, the other should go to W - if no heat with a call, the thermostat is bad.

Apr 17, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

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