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Trane xr12 heat pump switching to aux

I have a Trane XR12 today it got a tad bit chilly not much but i wanted to get the house a bit toasty anyways, I noticed that the air wasn't coming out warm, then it was, i looked at it because i thought it was odd, and it switched to Aux heat. that is the only way the heat will work, it is switching to AUX heat by it's self i live in South Ga so it doesn't get cold enough for the AUX heat, the outside fan works, everythign seems to be working fine but it wont stop switching to AUX heat any suggestions on what might cause this?

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  • smackdye
    smackdye Nov 08, 2012

    I dont know how to comment on each one so ill make a group effort "run capacitor for the fan" The fan works, it comes on with no problem......"you have a heat pump which removes heat from outside air when it is too cold out below 30*" it was like 60* outside........"How many square foot are you trying to heat? What is the outside temp? What is the inside temp? What size unit (BTU output) do you have?"..2000 sq ft., outside temp was like 55-60 degrees...inside temp was like 64 degrees I was just wanting to knock the chill out so i could shower...it worked perfectly last year, this year it isnt..no clue on the btu's

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  • Heating & Co... Master
  • 1,449 Answers

Sounds like the compressor is not running. Possibly a bad capacitor. Check system in cooling, see if it cools. If it does cool then you likely have a reversing valve issue. Good Luck!!

Posted on Apr 30, 2017

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Posted on Jan 02, 2017

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SOURCE: what does aux mean on a honeywell Thermostat?

The aux switch is for electric heat banks installed in the air handler. Depending on the outside temp. it may not be efficient to run in heat pump mode but in aux. or emergency would run the electric heat in the air handler.

Posted on Dec 11, 2009

  • 1175 Answers

SOURCE: outside fan runs constantly Aux Heat only 50%

Let's start out by your statement that the fan would not run, then you changed the contactor, not it won't stop running.
I believe, based on your info, here's what you need to do. Kill power to the unit. The 2 wires bringing power to the outdoor unit should be on the top 2 terminals. The 2 fan wires should be on the bottom 2 terminals. This is providing that the contactor is mounted Vertical. The could be an outside chance that the unit has a short in it and you are getting voltage feedback somewhere.
Take another look.

Posted on Dec 31, 2009

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