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Honeywell 7512A. Working fine. Turned off power yesterday notice no display so once power was restored I changed to new batteries. There should of been a display due to the batteries. New batteries were checked fully charged. Breakers were all reset. Batteries are in properly. Now I have no display. Polarity is correct. Wiring configurations is White to white. Orange to Yellow terminal. Green to green. Black to red terminal. Red to RC terminal. I have airconditioning and heating.

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SOURCE: changing thermostat matching wires trouble

Brown my friend is for the 4 way valve solenoid, that is if you have a heat pump, ( it uses freon for heating instead of natural gas) perhaps you got the wrong thermostat, if you have a brown you need a thermostat for a heat pump, a regular thermostat is not going to have a brown connection.

Posted on May 08, 2008

  • 61 Answers

SOURCE: Thermostat wiring

your best bet and where i would start is to identify where the coulors are conected at the fernace. in the industry we use standard wireing coulors wher green is g for fan and red is rh=switched trans power for heating . rc=switched transformer power for cooling . now normaly there is only one transormer so you would put a jumper from rc to rh and conect the red wire from the furnace to eather of these.jumper installed. the y is your cooling witch is normaly the yellow wire. o on the stat is for a heat pump if you nead to energize reversing valve in cooling mode . w is first stage heating and this can be conected to eather brown or white youll have to check at the furnace to see witch it is . the final wire eather brown or white should be conected to c or 24v common witch you didnt say you see on the thermostat. once again
red to rc and rh
green to g
yellow to y
brown or white to w
brown or white to common or c


please post feadback hope i was of help

Posted on Oct 21, 2008

  • 306 Answers

SOURCE: I'm installing a Honeywell RTH7600B

Every thing the same except take your blue wire and replace the yellow for it. So when you hook it to t-stat goes like this

Red to R
White to W
Green to G
Blue to Y


Posted on Jan 16, 2009

peyton32034
  • 410 Answers

SOURCE: thermostat wiring goodman model aruf032-ooa-1b

is this a heat pump or straight cool with heat strips?

Posted on Mar 16, 2009

  • 415 Answers

SOURCE: recently changed thermostat on gas furnace w/ cent air

Unfortunately, a strick standard does not exist for wire terminals and colors. However, there are "norms" which I will be happy to share with you.
Red - Rh & Rc (Jumpered)
Blue - C
Yellow - Y
White - W
Green - F


Note: this is assuming you have only ONE transformer in your low voltage circuit for both heating and cooling. If there is a low voltage transformer at your outdoor unit you will need to seperate Rc & Rh. At this point, I have to recommend a trained, qualified service technician. A good service technician should be able to resolve the wiring issue in under 30 minutes.

http://www.youtube.com/watch?v=_HyhUyU-AMI
I only wish I was able to look at exactly what you have to include tracing all the wire back to the furnace and condensing unit. Tracing the wire is the only sure-fire wire to do the job correctly.

I wish this could have been a black & white answer; however, I do hope you found this information helpful in your endeavor. Good Luck to you! :-)

Posted on Mar 10, 2010

Testimonial: "thanx,but i figured it out....new thermostat required a battery for led display...elim. blue added jumper-good to go....thanx though!"

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