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Replacing the thermostat, took the old one off without marking the wires. Hooked it up by color and we get the furnace when we put it on cool. wires are green, red, yellow & blue (ground wire)on the wall. The new thermostat wires are red, yellow & green. Can you tell me which wires go where correctly?

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The normal wiring for stats is white=w=heat,red=r=24volts,green=g=fan,blue=c=common,yellow=y=cooling.
see what ties into your furnace board and match the terminals.

Posted on Aug 12, 2008

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My white rogers f189 11 thermostat is off- nothing is lit up?


Remove the cover from the thermostat and check for voltage (usually 24VAC) on the red "R" wire. It comes from the transformer at or in the furnace. Place one probe on the screw marked "R" and the other probe to any of the other wires coming into the thermostat. Depending on how old and the type of system you have, you may have a black wire (Common or neutral), green (fan), yellow (cooling call) and white (heating call). Heat pumps and staged system will have more wires and other colors. If there is power at the thermostat, check that all connections are tight and you have a fresh battery installed if it has one. If it still does not work, replace the thermostst. If there is no power at the thermostat, check for power at the furnace. There should be a disconnect switch near the furnace, it may or may not be fused. Check with a voltmeter to see that you have power at the disconnect first and that any fuses are good. If it is ok, move on to the transformer at the furnace. Check the "Line" side of the transformer for 120VAC power and the "Load" side of the transformer for 24VAC power. If it is ok, and you have no power at the thermostat, the wires to the thermostat are bad or you have a loose connect at one end or the other.

Jan 10, 2015 | Air Conditioners

1 Answer

How do you hook up the thermostat to a Central Electric feh-017ha-04 furnace? Also, where do the A/C wires hook up to the furnace?


The standard color code for the HVAC is as follows....
Red=Hot or 24v
White=Heat
Green=Fan
Yellow=A/C
White 1=secondary heat.
Blue=Spare
Orange=Heat Pump
C=Common
The thermostat has the terminals marked R,Rh,W,G,Y.
The furnace should have a terminal strip with similar markings.
If you only have 1 control transformer this will be easy.
Hook the wires up using the colors I have listed. If you don't have the same color wires go with whats close to them....such as use Orange for Red etc. It really doesn't matter as long as they are landed on the same terminals on the thermostat and furnace. Two wires running to A.C unit outside put one on Y the other on C. If you need any more help let me know!

Jun 02, 2014 | Intertherm Air Conditioners

1 Answer

Havc thermostats


I will assume you did not write down what color wire you took of each letter on old thermostat? Sometimes color of wire doesn't matter as some installers will use whatever color. If you noted where each wire was on old thermostat, just put same color wire to same letter on new one. Under normal situation. y is for compressor (cool) G, is for fan (on AC) , RC is 24 volts from transformer for AC side, RH is 24 volt transformer from heat/furnace, and W is for other wire from furnace, is furnace is only 2 wire system. Was there any wire connected to A on old thermostat?

Apr 11, 2012 | Air Conditioners

1 Answer

I have 4 wires at thermostat, g, b, w, y. The old thermostat was removed before I owned the house. I would like a wiring diagram so I can trace the wires an know how to hook up. Thx. Ken


Trace the thermostat wires into your furnace and write down which color wire ties on to which letter at the furnace terminal strip. The HVAC color code is - g (Green) = house fan b (Blue) = auxiliary w (White) = heat y (Yellow) = cooling. If you need anything, let me know. And please vote on this response. Thank you.
Roger

Apr 03, 2011 | Air Conditioners

1 Answer

How can we tell if the thermostat is hooked up correctly. Can you send us a diagram of the colored thermostat wires attached to the unit?


if you open the door to the furnace or air handler (which ever you have ) and note what color wires go to what on the terminal strip or control board, and make it match what you have at the t-stat. In some cases the wire marked "Y" at the t-stat is mearly twisted to another in side the furnace and not attached to a terminal strip.

Dec 17, 2010 | Air Conditioners

1 Answer

How to identify what wires go to each terminal on thermostat for Induced Draft Gas Furnace...old thermostat discarded and wires not marked


Depending on what thermostat you have and existing wires. Typically red and white are for heat and yellow and green are for cooling. On base of thermostat there should be initials stamped to identify wires by color. R. W. Y. G. Possible Rc. and Rh if so for most uses you need to jumper these two together. You may have a blue wire instead of yellow or green. If so just hook blue to y or g. Hope this helps you. Thanks.

Dec 04, 2010 | Air Conditioners

1 Answer

How to set a NOMA HTM311A thermostat


Go to the furnace, and see what the black is connected to. If it is not the Y terminal, disconnect it from the Y terminal at the thermostat. While you have the furnace open, check for a blown fuse inline to the transformer or on the control board. If the black was connected to the common or the transformer, and you connected it to the Y, and turned the thermostat to cool, you would have a direct short across the transformer output. You can use a black wire to control the A/C, but both ends need to be connected to a Y terminal.

If you still remember the where the 4 wires were connected to the White Roger thermostat, take note of the name of the terminals the 4 wires are connected to. That may help as sometime the colour of the wires are not always correct.

Or you really want to test it out:
connect RED wire to GREEN wire should turn on the fan
connect RED wire to WHITE wire should turn on the heat


Did you disconnect the power at the furnace first? Maybe you blew a low voltage fuse.

Make sure you increase the heat setting to go above the room temperature.
Thermostat wire color codes explained.
Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.

R (red) or Rh (Red heat) 24 volts from equipment.
Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
W (White) sends 24 volts to furnace control to start the heating cycle.
W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
C (common) most often brown but can also be black or other color available to installer.
O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).


Hope it helps.


Thanks for using fixya.....

Nov 29, 2010 | Air Conditioners

1 Answer

Outside ac unit operates but no blower. Fan "on" does not operate from thermostat. However "heat" works fine furnace and blower. ???


Go to furnace and shut off power, remove blower door compartment. Inside you will find a control board where thermostat wires are connected. Should look something like this:

R-Red Wire= Power
G-Green Wire= Fan
W-White Wire=Heat
Y=Yellow or Blue Wire=Cooling.

It sounds like you have a bad motor speed. So try this:

With Power Still Off, on the same control board there is a terminal usually marked Cool and Heat. There should also be a couple of terminals that are named park. The wires hooked to these are the fan wires..

Exchange the Heat and Cool wires on the terminal board. Put everything back together and try cooling again, if the fan comes on
then you have a burnt out motor speed. Go back to furnace and change
the heat and cool wires around, next if Cooling had the black wire hooked to it, put yellow or blue on Cooling and black to park.


Note: The reason why you put the blower door back on is because it
has a door switch that if not properly seated, you wont be able to power
up anything

Jun 22, 2010 | Air Conditioners

1 Answer

Thermostat Wiring Problems!!!


. your blue is probably common and if you hooked it to Y you shorted the transformer or blew the low voltage fuse. Green is fan, yellow is AC, Red is 24volt. Is it a heatpump or just ac? I think its probably a heat pump and your brown is your Reversing valve it needs to be hooked to O on the new stat. If its a heatpump your tstat must be a 2heat 1 cool stat w/ aux heat. Without knowing what terminals the wire were hooked to on the old stat you may have to look at whats hooked up at airhandler( furnace) and on A/C (heatpump) tobe able to determine what goes where on the new one.

Sep 20, 2009 | Air Conditioners

1 Answer

Thermostat wiring


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Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.
  • R (red) or Rh (Red heat) 24 volts from equipment.
  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

Jun 02, 2009 | Carrier Air Conditioners

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