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I disconnected the thermostat and I cant remember where the wires connect to.

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  • Rob
    Rob May 11, 2010

    Meaning what? Is this an outdoor AC unit with an indoor (on-the-wall) thermostat?

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  • 144 Answers

Gas furnace-a/c is usually:
R- red
W-white
Y-yellow
G-green
C-blue or black if needed
for heat pump add:
O-orange

Posted on Feb 27, 2009

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How are the wires connected from intertherm thermostat to nordyne E1EB-015HA unit


There's probably about 10 different ways to wire them together. If rh & rc where jumped together an tstat then R-RED W-WHITE G-GREEN Yellow (from tstat) to Red to outdoor unit if that's what they had connected outside(should be a red & white outside). If rc & rh were not jumped together @ tstat? The unit has 2 transformers and its a bit different. Rh is 24v from the inside and rc 24v from outside. And also we can use any color we want so who knows what the last guy used. Try this, install the new tformer and at the line voltage wire(L1 or load wire) get a couple of spade connectors(terminal clips) and put one on the tformer and one one the line wire. Then use a 3amp or 5amp blade fuse(auto parts store) and connect your line voltage wire end and tformer wire end to that fuse. But don't let them touch metal or each other. And buy a handful of them fuses(no greater than 5a!!). This protects the tformer as long as its done right. Then reconnect what you remember to be right or just connect 1 wire at a time. Try fan on and cool or heat, 1 wire at a time, and if the fuse opens you know that one is wrong. There is no way you can get the answer you need without knowing what wires are connected to what inside, outside and at tstat. Hope this helps and WORK SAFE!!!

Jul 29, 2015 | Intertherm Air Conditioners

1 Answer

Where do thermostat wires connect to outdoor a/c unit nordyne s3qa series


I cant see your cable or terminals, I don't know who made the A/C or thermostat - so it's hard to know for sure.

You could look at the other end to see which terminals the red and white wires are connected and connect them to the same terminals at the other end.

Otherwise, they are wired to follow a color code. Red wire to the "R" terminal and White wire to the "W" terminal.

Good luck!

Jul 20, 2015 | Air Conditioners

1 Answer

Have a goodman central air unit, non heat pump. keeps smoking transformers, on the inside unit, replaced fan capacitor and transformer as the old transformer was smoked as well. But to no avail the new...


There is a short in the control wiring that needs to be tracked down. Ohm the wiring to the low voltage controls, ie thermostat wiring and thermostat. Try disconnecting the thermostat wires to rule out the problem in the control wiring to the thermostat or thermostat itself, then install a new transformer without connecting the thermostat wiring, jump the red and green wire at the unit low voltage connections to test blower, and then add yellow for compressor, should be no more than 3 amps on control side wiring with A/C on.
If the problems still exists without the thermostat wiring connected then there is a problem in the wiring in the unit or control board itself.

Aug 24, 2011 | Air Conditioners

2 Answers

{my thermostat was flashing filter} I replaced filter and now air conditioner wont kick out cold air rth230b


Remove the thermostat wires and reconnect wires after 10 minutes. Then check. --------- yellow wire on thermostat is for cooling.Disconnect the yellow wire bolt remove yellow wire and then see if AC works will yellow wire unplugged..If its works that means the Thermostat is the issue.It has to be replaced. On some newer honeywell thermostats.there is blue wire instead of yellow wire.The connection is same, but blue wire is there instead of yellow wire.In that case disconnect blue wire and then see if AC works with blue wire disconnected. ---------- Check this.This will help.Thanks.Helpmech.

Jun 07, 2011 | Honeywell Air Conditioners

1 Answer

My thermostat wires got pulled out of my outside unit and need to put them back but dont know where to start. The wires coming out of unit are blue and yellow and the norm thermostat wiring witch wires go...


Hello Cadbiad Jason,

I understand that your wires go to you outside unit (condensor) have been pulled out. To start with you have two thermostat wires look like telephone wire, and three power wires a ground usually bare or green, a white 120 and a black 120 volts.

I would be glad to help you with your problem. The first thing you need to do is shut off the disconnect box located by your unit as you do not want to get shocked by 220 volts.

1. Disconnect all power to the unit and turn off the thermostat.
2. Take the service panel off the side of the unit (1/4 or 5/16 screws)
3. The service panel you will notice a contactor this contactor will have two connections on the front and back for the white and black wire one side is for power from the disconnect the other side is the power going thru the unit to its parts. Make sure all of these connections are tight.
4. On the sides there are spade connectors one of your thermostat wires goes to one side and the other one goes to the other side (it does not matter which one goes where on a two wire non heat pump unit) you can wire nut each wire to the the ones if they are still usable. If not you will have to crimp new ends on your wires.
5. Replace the service panel
6. Turn the disconnect back on
7. Turn on your thermostat and make sure the unit turns on

If you have any further questions about this unit please fell free to post them to this thread and I will be happy to assist you. Thank you for choosing FIxYa.com

Justin

Mar 26, 2011 | Goodman Air Conditioners

1 Answer

On my goodman ssz160481ab heat pump. When going into either heat or cool mode the contactor won't hold. its as if the coil voltage is going on and of very fast causing the contacts to burn out. I replaced...


Disconnect the yellow Y1 wire from the thermostat to the control board in the air handling unit and read the voltage from C - common to the yellow wire. It should be 24 VAC, 0 VDC. If it is, cconnect the wire back to the control board. Now, disconnect the yellow Y1 wire at the outdoor condenser. You should have 24 VAC, 0 VDC. If you have the lower ac voltage and the dc voltage, you may need to replace the control board. Please shut down power before removing or connecting wires and remember to wait for the 3 minute delay before checking the voltage

Dec 12, 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

Need to know full low voltage wiring information to thermostat


Usually the Red wire provides 24v and connects to the R termenal-
Next the Green wire is to the indoor blower motor and connects to G terminal-
Next the Yellow wire is to the outdoor unit to call for cooling and will engage power to the contactor solenoid to pass 240v power to compressor and power to Start/Run capacitor and fan! It will connect to the Y terminal-
Next is the White wire an it calls for Hea and is connected to the W terminal-
If you have an Orange wire it is for the reversing valve of a heat pump system.
Remember the red feeds 24v to each of these colored wires to complete a connection and pass power to the device being called into action.
BLue or Black wire will be ground if the thermostat needs power instead of batteries.

Red wire is the only hot 24v wire going to the thermostat period! And it comes from the Transformer!

Oct 08, 2010 | Air Conditioners

1 Answer

No air fan is blowing


MAKE SURE THERMOSTAT IS SET TO AUTO AND COOL OR AUTO AND HEAT...IF SWITCHES ARE SET TO ON AND OFF ONLY THE
FAN WILL RUN....IF YOU CAN'T FEEL ANY AIR HOT OR COLD THEN
YOU HAVE A VERY DIRTY INDOOR COIL OR FILTER OR BLOCKAGE IN THE PLENUM OR BROKEN OR DISCONNECTED DUCT WORK...IF YOU FEEL AIR AND IT IS NOT COLD YOU MAY NEED A FREON CHARGE TO YOUR UNIT. ALSO CHECK ALL BREAKERS AND CHECK INSIDE AND OUT FOR DISCONNECTED WIRES , SHORTS , GROUNDS , FUSES , AND MAKE SURE THERMOSTAT WIRES ARE CONNECTED TO THE PROPER TERMINALS. IF THEY ARE NOT THEN CONNECT THEM TO THE PROPER TERMINALS. REMEMBER..LOOK FOR THE SIMPLEST THINGS 1ST.

Apr 07, 2010 | Goodman PHKJ060-1 Air Conditioner

1 Answer

I have a Coleman Presidential 7670 furnace in a mobile home. customer said it came on a couple of times by itself. I ran new wire, fan won,t shut off. Replaced fan switch, fan still won't shut off....


Brian, it sounds as if possibly the fan relay is stuck however, if the fan will not shut off I would suggest the following, Follow the wires from the fan to the relay on the relay disconnect the fan wire there and see if the fan shuts down if so there is the problem. If not you possibly have a short in the thermostat wire What can be done is take a small section of thermostat wire and disconnecting the existing thermostat (red 24 v power feed, green, is fan motor control, yellow is compressor control, white is heater control,) once you have disconnected the existing thermostat wires take the short peice of wire and connect it to the terminal block, once this done the other end (do not hook the wiring to a thermostat have the wires bare at the ends about 1/4 inch) Manually connect the red and green wires togather and see if the fan activates. If it does disconnect the r,g wires if the fan still runs then the fan relay is stuck, if not then it sounds as if there is a short in the wiring between the thermostat and the terminal block. Also check to make sure that you have set the thermostat setting itself to either gas or electric since the newer thermostats have the option of being used as gas or electric. Good Luck on your repairs.

Dave in Texas

Sep 01, 2009 | Air Conditioners

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