Understanding and Wiring Heat Pump Thermostats with AUX & Em. Heat! Terminals, Colors, Functions!

This HVAC Video is about Heat Pump Thermostats- the wiring color code, terminal functions, and exactly what happens inside the thermostat as well as what the difference is between the heat, aux, and emergency heat. Thorough knowledge of these functions will aid with troubleshooting procedures to solve problems with the heat pump. Supervision is needed by a licensed HVAC Tech before doing this as Experience and Apprenticeship garners Wisdom and Safety.

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[jefferylegere]

saved my bacon. thank you. last technician left our aux connected to the reversing wire (at the air handler). so when the heat was needed it was just activating the reversing valve thinking it was the heat strips since, from the thermostats point of view, the heat pump wasn't keeping up. With this I was able to get the strips and the reversing valve straightened out.
we don't use much heat most winters so this went two years undiscovered.

[erictofsrud]

Out of all the Youtube videos explaining the wiring, specifically the AUX and Emergency heat wires, you explained it the best. I went 6 years with a heat strip that was not working. Although I'm in Sacramento, it still gets cold at night in the winter, and I never understood why the unit started grinding away all night and not producing heat when the outside temp was below 32. Turned out it was just a 40 amp fuse. Replaced it, and man, that's some good winter heat now, that comes on when there's a 3 degreed spread between the setpoint and the inside temp.. Thanks for helping me understand it's operation!

[Union]

Thank you! I had a new heat pump and thermostat "professionally" installed a few weeks back. Came back from being out of town last night to find that the aux heat (heat strip) didn't work. This was the first time it was cold enough to need it. While waiting for the HVAC company to return my call, I cracked open the manuals for the heat pump, air handler, and t-stat. Having zero HVAC experience, it was still a little confusing. By 3:15 in this video, it was clear to me that the white wire was connected for a conventional system vs. heat pump. I was relaxing in a warm house by the time the HVAC company called back.

[juliocalvet]

thanks for all that you do for all of us out here in  the real world

[drivewaygarage]

I added a new thermostat but I forgot to take a picture of the old one with the wires on it so I was lost. I kept blowing fuses but after watching your video I got it hooked up correctly and now it works, thank you very much.

[imtruth]

Great information and explanation. That helps a lot. Thank you very much.

[dariusthomas]

I’m in a hvac class and I understand you more

[hectorjr.]

Your videos are by far the most helpful. Thanks for your time and knowledge!

[jefferyhicks]

Very good video! I have a trane package heat pump and a touchscreen trane thermostat and I believe the wiring is incorrect because my auxiliary heat will not kick on when the pump falls behind, the only way I can get the temperature back up is turning the emergency heat on. Any help would be greatly appreciated 🙏

[ParadoxEP]

Question does it matter if the main W cable goes into the E or Aux first if they are connected by a jumper?

[Bluezhealer]

So the majority of Heat pumps use the O terminal on @ the thermostat with the reversing valve being energized in the cooling mode keeping the refrigerant flowing normal direction correct?

[meerscan]

good video, love the cricket in background

[chrismaddox]

Really nice presentation! Learned a lot! Thanks.

[sicosico]

Love this thing and it is very well made for the price

[jimhoffman]

Silly question in Florida we use heat pumps versus resistance heating and the heat pump wiring configuration versus conventional. The odd part is my Honeywell has the white wire into aux/E and no other w connections terminated in the existing Honeywell thermostat. However, I am Hooking up to a smart thermostat with a W/E connector I assume that is where I put the white wire as it is really an aux configuration with an Orange o/b setting for the bar? The smart app said my schematic is good and everything seems to work but I don’t want something to happen in the winter when heat turns on lol

[IPINGU]

Excellent explanation, thank you. I have RH and RC tied together. Can you explain that? Actually I have the red wire on RH and it's jumpered to RC. White on W
Yellow on Y
Green on G
Black on C
Orange on O
White on W

[Pretzel]

Hi ACSERVICETECH! Great video, I drew a diagram and labeled it just like you explained. Excellent work. Thank you!

[davemurray]

Great video. Is there a way to have the heat strip turn on when the unit goes into defrost mode so it doesn’t blow cold air into the ductwork? Or have heat strip turn on continuously when thermostat is calling for heat and recirculating fan is running.?

[skipper]

Sir, unit without heat strip, thermostat aux and emergency wire is installed can I remove it ? Thank you for all what you do.