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Tstat wire came off unit outside. Need to know what colors to hook it up to xformer.

The mutt chewed through the tstat wire to the outside unit. Two wires go to the xformer. Which wires do I hook up?

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Usually it's red and yellow

Posted on Apr 20, 2009

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Posted on Jan 02, 2017

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On a good man air handler aruf61d14aa model we have trouble with low voltage wiring. Already blew one fuse so thinking I have wired it wrong.


Red is power green (or in a goodman might be grey) lands on g which is for your indoor blower white is for heat. Yellow from the tstat( which doesn't land in the air handler ) is for cooling and goes out to the condenser along with the blue which is common. First unhook all your tstat wires. Put red and green together to turn on blower. Turn power on and make sure it's good. Then add white for heat, turn power on and make sure you're good. This will ensure YOUR PROBLEM IS OUTSIDE the air handler. Then ONE WIRE AT A TIME add back your tstat wire, turning power off and on after each wire. First do red. Then do green then do white then do yellow. TURNING POWER OFF EACH TIME. IF AND WHEN THE FUSE BLOWS you will know what part actually blows the fuse. Let me know. It's possible your contactor outside is shorted and blowing the fuse. This will blow the fuse only when you hook the yellow from the tstat up to the wire going outside to condenser. Remember to unhook everything first. Let me know if you need more help.

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1 Answer

Thermost wireing to th compressor.my dog riped the wireing out and where does the brown low voltage wire go its unplugged and just laying in the umit


It should be a 2 wire hook up. If you can obviously tell what to wires were used (meaning the rest are wrapped around) then it should be easy. Turn off unit at tstat. Turn off power to condenser. Open panel and locate likely a blue and yellow wire but regardless the color they should be the only wires that are not landed somewhere. The can be traced to the sides of the contactor. The high voltage goes to the bottom, low voltage to the sides of contactor. Wire nut your 2 "obvious" wires. If you can not tell what 2 colors were used you will have to look in furnace/air handler. TURN POWER OFF FIRST. Typically you'll have 2 sets of low voltage in the furnace. One goes to the tstat the other to the condenser. Track the wire that comes in with the copper through the wall. This is likely your wire that goes outside. Whatever 2 colors are used inside you must use outside. Good Luck!!

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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!!!

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BDP Heat Pump Transformer Keeps Blowing


Should have a 5 amp fuse on red wire in between transformer and tstat. If not put one. This will protect transformer. Turn power off and take a good picture of tstat wiring. Remove all wires to the tstat. With the air handler wires join fan and red. (Likely green) let run. Then add compressor and reversing valve ( if reversing valve is energized in cooling ) which in most cases it is. Should then have cold air. Let run. If no problems you know it's outside of the machine. Tstat or wiring. Hook inside of machine all back up to tstat wires. Do the same thing with the tstat wire inside the thermostat. If no problems, must be bad tstat. Hook everything back up right. If fuse blows or transformer because you didn't put the fuse, then you know for sure it's the stat. Good Luck

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Ok. heatpump change out, 17 year old rheem to adp air handler and weather king heatpump 3 ton outdoor. The wiring from the thermostat is killing me in the attic. I got the cooling side to work, and also...


If your heat strips come on with out the fan then you need to change the settings on the tstat for electric heat rather than gas. Or change the setting to where the tstat controls the fan. But, sounds to me like you have your tstat miswired. Did you wire in the reversing valve? Is the valve energized in heating or cooling? Tell me what colors land where at all three locations.

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1 Answer

3 ton carrier split unit heat&cool,mod#38QH036300DL, Heat is good, thermostat will not shut it off. only way to shut the inside unit off is turn off the circuit breaker


Sounds like a bad tstat. The Tstat does control the on and off of the unit.
You can check the Tstat by taking off the white wire to the tstat and turning the heat to the on position and if it still comes on you have a bad wire. If it does not come on then you have a bad tstat.
Another option is to open the furnace and look inside at the control wires and follow them back to ensure that they are not shorted together anywhere inside the unit before checking the tstat wires.
If its the control wires then follow option 1 if not follow option 2.
1.Normally people who run tstat wire pull more wires than necessary to the tstat. Because of this you can use a different one for the heat which is white on the tstat. Remember that if you use another color on this then you need to change it on the inside unit as well. Otherwise it will not work. In other words change it on one end of the line you have to change it on the other to make it work.
To check the tstat wires, use continuity. Take all the wires off the tstat and the inside unit. These are the small control wires, not the main 110 wires. Check each one against each other to see if any of them are shorted together. Be sure to write down the wire colors and the terminals that they belong to on both sides before you take them off otherwise you will have big problems...
If you do not have another wire then pulling a new wire will be the next option.

2. If this does not solve it, then its the TSTAT, Replace it. Hope this helps.

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Did you replace the defrost board out in the outside unit? Or did you replace the control board just on the airhandler? You need to check if the board outside is functioning. Also, put the unit in cool and check to see if the outside unit is being called to come on. What could of happened is the unit was the compressor went out and that's why it didn't work in Aux. and only in emergency. I would just recommend checking the outside for issues since the inside unit is operating in emer. It could possibly be the tstat also. Just buy a tstat for a heat pump and follow the instructions. The key is to label your wires with what color is going to what terminal (r,w,g,o,y etc...) and then use the new tstat instructions. Better yet, buy the same brand t-stat. Hope this helps.

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