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Got a honeywell t8400c thermostat i'm trying to replace with a honeywell rth3100 honeywell thermostat but only have yellow green red and white wire on the old and don't know where to put the wires on the new

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R--- rc or rh y--yellow g---green w--white red is power yellow is cool g--fan white is heat

Posted on Sep 03, 2008

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1 Answer

Changed honeywell T8400C 1024 to Hunter 44760, I have five wires white, red, yelliow, green, blue. Hunter Thermostat reads "NO A/C Power.


Hi,
On the t-stat and the furnace make sure the wires are hooked like this...

Red to R
White to W
Green to G
Yellow to Y
Blue to C

then it should work..

Thermostat Wiring and Terminal Designations

heatman101

Jun 12, 2011 | Heating & Cooling

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Replaced Bryant T-stat model TSTATBBNB001 with Honeywell t-stat


Your original wiring configuration seems to indicate that you have an air conditioner (not heat pump) and either a gas or electric furnace. If this is the case you may need a different thermostat for your application.

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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

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1 Answer

How do you wire a honeywell round mechanical thermostat


What are you trying to wire up?
Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Feb 09, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

Honeywell RTH230B works on AC not on Heat


check wiring to furnace check wire hook ups on board match letters and colors sometimes installer use what ever wiring they chose on letters

Oct 16, 2009 | Honeywell Electronic Programmable...

1 Answer

RTH3100C thermostat Have 4 existing wires; Yellow(cooling),white Heating) green (Fan) and red (power) WWhat terminals to use at above stat?


The RTH3100 is a heat pump stat. Your wires indicate that you have a 1h/1c operation. This is the wrong stat for your application and will not work.

Oct 10, 2009 | Heating & Cooling

1 Answer

Help! replacing WeatherKing thermostat with Honeywell RTH230B


RC AND RH CONNECT BOTH WITH RED
Y TO THE YELLOW
G TO THE GREEN
W TO THE WHITE

Sep 18, 2009 | Heating & Cooling

1 Answer

I'm installing a Honeywell RTH7600B programmable thermostat and replacing a Honeywell T87F2873. The new one calls for a Red, Green, White, and Yellow wire, while I only have a Red, Green White and Blue....


Every thing the same except take your blue wire and replace the yellow for it. So when you hook it to t-stat goes like this

Red to R
White to W
Green to G
Blue to Y


Jan 16, 2009 | Heating & Cooling

4 Answers

Replacing thermostat


What is the blue hooked up to now?

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