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Problem wiring new thermostat - Air Conditioners

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Posted on Nov 16, 2008

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W and W2 wiring on old thermostat...where do they go on the new thermostat?

It depends on the equipment you are connecting the thermostat to. If you have a heat pump, the thermostat must be wired differently than if you have separate heating and cooling equipment. If you have a two-stage or modulating furnace (or boiler), the w and w2 wires will conect for heating, and the y and g wires will connect to the air conditioner. Naturally, some configuring must be done with the new thermostat so that it acts correctly. w-w2-wiring-old-thermostat-go-new-u40lsvyytnuesyuv3fbafhtd-1-0.jpg
please mark this answer helpful.

Feb 22, 2013 | Honeywell RTH6400D 5-1-1-Day Programmable...

1 Answer

Rheem Heat Pump Thermostat Replacement (#41-20804-15)

you need a 2 stage heat and cool t-stat hunter t-stat is not 2 stage

Feb 19, 2013 | 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

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

1 Answer

How to connect to my Air conditioner AZ28E15DABm1 GE a thermostat model TR400 HC-A SECO?


carefully follow the below steps;

Turn off the circuit breaker that controls the air conditioning system. Turn the thermostat to the "On" position to make sure that all power is cut off and the air conditioner cannot accidentally operate.
Remove the cover of the existing thermostat and remove the colored wires from the terminals. Take out any screws that secure the thermostat to the wall, and remove the thermostat.

Mount the new thermostat on the wall. Feed the wires through the unit, with enough slack to allow you to make the new connections.

Connect the red wire to the thermostat terminal labeled "RH," "RC" or "R." The red wire carries the power from the transformer.
Connect the green wire to the thermostat terminal labeled "G." This controls the relay that controls the fan. Attach the yellow wire to the "Y" terminal of the thermostat. This powers the main control. Connect the white wire to the "W" terminal. This is the heating control wire.

Close the thermostat's cover and turn the breakers back on. Turn the new thermostat to the "On" position to test it and that would be all.

I hope the above helps. If it is not helpful, please let me know so that I may direct you further.....

Good luck.

Feb 25, 2011 | GE Zoneline AZ38H12DAD Split System Air...

1 Answer

I just purchased RTH2300B, Connected R w/R, G w/G, W w/W and Y w/Y left out Blue wire that is connected to Furnace on C. No heat comes out just cool air. Need help; frizzing

you the same person last night that posted .... my understanding is that you had a different type of thermostat originally with more wires on the old thermostat correct? from your post last night you have a heat pump system and this rth2300b thermostat is a straight cool straight heat thermostat... does it have batteries on the new one and does the new one not have a "c" terminal" post again what exactly was on the old thermostat color of wires going to what terminals on the old thermostat.. then tell me what you have for the new thermostat we can get you some heat... at worst case you should be able to jump out the red wire with the white wire at the thermostat and the heat should come just will not be able to shut off without taking the wires apart but can get the house warm...

Jan 02, 2011 | Air Conditioners

1 Answer

I have no voltage to my thermostat

Possible transformer problem or a broken wire between the thermostat and the a/c

You will need an electric meter to check for voltage at the transformer One side should be the power feed and the opposite side should feed the 24 volts, or 12 volts depending on type of unit.

I suspect that there is a break in the thermostat wire to the unit. You can test this by getting enough wire for the thermostat and go to the board on the roof top unit where the thermostat wire connect and connect the wires that you have to the existing board i.e. red to red green to green and so on. once you have connected these wires to the proper screws then take a new thermostat and connect the wires to the new thermostat and activate this should tell you if there is a break in the wiring or possible transformer problem but as I said I think its a break in the wiring


Mar 19, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Usually there is a blue wire to the thermostat but in this case it is not. instead there is a black wire. i used that one as blue. now there is no heat. it is a hunter cool/ heater unit.

Red Wire Old to

New RC and RH Terminal

Y Old = W ?

New = Y1 Terminal

G should be for the fan Old to

New =Green Terminal

White is for Heat W2 Old to

New =W/B tremnial

X2 Is used only on 24 volt thermostat that need 24 volts to opperate the thermostat usly not used on most thermostat
To start I would not hook this wire to any thing just yet
Tape it so it can not short any thing Black Wire

Orange Old to

New Y/O Not used

Jan 03, 2010 | LG LSC183VMA Split System Air Conditioner

1 Answer

Wiring in a new thermostat

yes .common as in the netural side of the transformer x to cif not hooked up the stat will still work. and honeywell has good support for their products . Tom

Jun 20, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Im changing an old honeywell thermostat with a new honeywell thermostat. the old on has wires 4 wires connected to 4 screws C,R,G,W but the new thermostat has a place where the wires go which are...

Yes, I believe that you will be fine. If the original wiring is correct then I have listed the basic wiring below. As always read the directions and make sure the wiring matches your system.

Red wire = Rh (24v power, should have an exsisting jumper to RC)
White wire = W (heat mode)
Yellow (or sometimes blue) wire = Y (A/C)
Green wire = G (Indoor Fan)

Jul 03, 2008 | Honeywell Air Conditioners

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