I have a Trane Heater/AC unit no heat pump with a thermostat model 802AS32DAA that has seven wires. I am going to a five wire heating/cooling thermostat. What do i do with the two extra wires? old thermostat red wire-RC slot (24 V from A/C) white wire-W1 (???) yellow wire-Y (A/C Compressor) green wire-G (A/C Fan) black wire-B (?????) Blue wire-Y2 (????) orange wire-W2 (24 V to Furnace new thermostat therminals G Rc Rh Y/O W/B Y1 Can you tell me what wires to connect to each terminal? THANK YOU VERY MUCH

Yes you probably did. First question: Why did you replace thermostat? (This will give us a better clue as to what is actually wrong since thermostat is rarely the problem.) You'll have to give us more info. What brand and model thermostat, furnace and ac do you have. How many conductors (wires) are at thermostat location? And what color are they? Also make sure that the thermostat is set to either gas electric or heat pump. Model numbers will tell us. Another possibility is that there's a short in your wiring.

Chances are it's your reversing valve that is sticking. It's also possible that for some odd reason if you lose power to the tstat that the settings are changing. What type of tstat do you have, does it have batteries? What you need to check is when the unit begins to cool when there is a call for heat, do you actually have 24 volts AT the reversing valve. It's also possible that you have some bare spots on the tstat wire therefore orange is in fact being energized by the yellow wire NOT the tstat.

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the colors of old system are for heat pump.if you have a heat pump you need heat pump thurmostat and colrs will make more sense.if not,then you need to go into furnace to see what colors go where.yellow is cool, goes to compressor contactor,usually another wire going from furnace to outside unit.green is fan relay rh is heat call rc is cool call

Honeywell Chronotherm thermostats have always had a great reputation for longevity and reliability. They are also much more user-friendly than the other types of programmable thermostats out there. Make sure you get one that states 2-stage heat, heat pump. T8611G will offer that for you. There are many out there that claim to be suitable for heat pumps; however, they do not have the ability to utilize your auxiliary heat strips (2nd stage of heat).
Before you attempt to replace, be sure to write the wire colors and their corresponding terminal marking on a sheet of paper........of your old thermostat. This is very important to make it easier to hook up the new thermostat. Also, before you disconnect the wires, be sure to shut off the circuit breaker to your air handling unit. You can ensure you have the right one by putting the fan switch in "ON". When you turn off the right breaker, the fan will stop running. :-)

I hope you find this information to be very helpful to you. Please don't forget to leave a rating.

You might have some thermostat wires that are touching meaning the insulation has been broke off and getting a direct short. Check the wiring going to the outside unit and replace any wire that is in bad shape. let me know okay. Ken

your trane heat pump energizes the reversing valve with O - orange y - is to turn on the unit make sure you have your orange wire hooked up and the tstat programming set to heatpump otherwise your reversing valve might be bad

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} 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).

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} 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).

you have to configure the thermostat to run the fan when there is a call for heat. look at the installation instructions and they shoud ask you if it is gas or electric heat if its electric then you are gong to have to configure it to makr e the fan come on with the heat. Good luck