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Forgot to mark wires in old thermostat - Honeywell Heating & Cooling

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Posted on Jan 02, 2017

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SOURCE: Forgot to mark wires before removing old thermostat...

You can take a look at the blower unit where the wires from the thermostat connect to. Usually they're labeled on the circut diagram on the front panel, or on the board itself.

This site may also be of some assistance.
http://highperformancehvac.com/thermostat-wiring-colors.html

Posted on Oct 12, 2009

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Therinnaiguy
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SOURCE: Three wires not marked for new Thermostat!

You will need to go to the heating system and see what color wires are hooked to that. Typically the black and white wires will be used unless they used another color due to a bad wire. Hook the colored wires to the R or RH terminal on the thermostat and the other wire to the W terminal. You can also try taking the wires you have and one by one twisting them together and have a second person inform you when the heating system turns on. Take those two wires and hook them to the terminals I mentioned above.

Posted on Jan 14, 2010

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SOURCE: How to identify what wires go to each terminal on

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.

Posted on Dec 04, 2010

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Do NOT take wires off the old thermostat yet, or mark the color wire, to the terminal letter. Most times W,Y,G,R, terminals and maybe even a C terminal.

Your new thermostat should have the same letters. Sometimes they mix up color wire with terminal letters...... example (yellow wire to w terminal)
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Three wires not marked for new Thermostat!


You will need to go to the heating system and see what color wires are hooked to that. Typically the black and white wires will be used unless they used another color due to a bad wire. Hook the colored wires to the R or RH terminal on the thermostat and the other wire to the W terminal. You can also try taking the wires you have and one by one twisting them together and have a second person inform you when the heating system turns on. Take those two wires and hook them to the terminals I mentioned above.

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Forgot to mark wires before removing old thermostat...


You can take a look at the blower unit where the wires from the thermostat connect to. Usually they're labeled on the circut diagram on the front panel, or on the board itself.

This site may also be of some assistance.
http://highperformancehvac.com/thermostat-wiring-colors.html

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