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    TexasYankee's Avatar
    TexasYankee Posts: 1, Reputation: 1
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    #1

    Feb 16, 2009, 08:28 PM
    Thermostat reads low battery
    I have a Honeywell thermostat which reads low battery. I replaced the batteries with fresh batteries and even turned the circuit breaker off and on. Yet it still reads low battery and there is no heat coming from this section of the house. (Master bedroom is cold) What do I need to do?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Feb 16, 2009, 08:58 PM

    Many times a reset button needs to be pressed with a paper clip etc, to restore operation after replacing the battery. Check the manual.
    tboy56's Avatar
    tboy56 Posts: 9, Reputation: 1
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    #3

    Feb 21, 2009, 06:11 PM

    Hit the reset button
    scohen5052's Avatar
    scohen5052 Posts: 2, Reputation: 1
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    #4

    Jun 4, 2010, 09:43 AM
    I have a Honeywell programmable thermostat which was installed about 3 years ago. The screen reads "Low Battrey" but I do not know how to open it to replace the batteries. There does not seem to be any way to open it.
    fullwit's Avatar
    fullwit Posts: 1, Reputation: 1
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    #5

    Nov 25, 2010, 10:43 AM
    The older models do not have a reset battery so this is what I did to reproduce a reset.

    Remove the old batteries.
    Install the new batteries with incorrectly facing terminals. (+ goes to - and - goes to +). This will completely power off the unit.
    Remove the incorrectly installed batteries and let the unit sit for about 15 seconds.
    Install the new batteries correctly - the unit should now start flashing 12:00 time - you're all set!
    Set the time and date and you're ready to roll.

    Hope this helps someone!
    xJPxCAx's Avatar
    xJPxCAx Posts: 1, Reputation: 1
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    #6

    Mar 26, 2011, 12:18 PM
    fullwit s totally right. Just install the batteries incorrectly for 15 seconds and then install them in the unit correctly and you should be good to go!
    skd86mld's Avatar
    skd86mld Posts: 1, Reputation: 1
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    #7

    Jun 6, 2011, 06:00 AM
    Reversing polarity did not work for us. Any other suggestions.
    AlteredChords's Avatar
    AlteredChords Posts: 1, Reputation: 1
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    #8

    Nov 19, 2011, 08:26 PM
    The polarity reversing scheme has worked for me. I now have heat. Thank you Fullwit.
    RealityCzech's Avatar
    RealityCzech Posts: 1, Reputation: 1
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    #9

    May 5, 2012, 08:04 AM
    Thanks! This did the trick!
    linuxdood's Avatar
    linuxdood Posts: 1, Reputation: 1
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    #10

    May 21, 2012, 01:03 AM
    Reversing batteries helped here too!
    Thanks!!
    Artdog17's Avatar
    Artdog17 Posts: 1, Reputation: 1
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    #11

    Jul 8, 2012, 03:25 PM
    My Trane XT 302 wall thermostat says on the display it needs new batteries. I had it professionally installed and don't seem to have the manual. How can I open the wall-mounted thermostat to replace the batteries. I've looked carefully around all the edges and there are no markings to open.

    Thanks---Hope you can help! It's a heat wave and my ac seems to have stopped along with the thermostat.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #12

    Jul 8, 2012, 04:24 PM
    Try to squeeze in different areas to separate the front from the back.
    Change batteries quickly and don't press any buttons to maintain any Programming.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #13

    Jul 8, 2012, 07:25 PM
    You manual is here: Trane OWNER'S GUIDE Thermostats XT300C, XT302C | ManualsOnline.com for free.

    I'd suggest calling the help line because there is no reference to a battery even though there may be one. Sometimes a small lithium batter which is deamed non-user replaceable is inside the thermostat. It's only purpose is to maintain the settings when the power goes out and therefore the battery may have a 10 yr life. That lifetime may the manufacturer's expected lifetime for the thermostat.
    dmdegrassi's Avatar
    dmdegrassi Posts: 1, Reputation: 1
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    #14

    Sep 29, 2012, 06:34 PM
    Thank you fullwit! Your suggestion worked!! :)
    roscoej's Avatar
    roscoej Posts: 1, Reputation: 1
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    #15

    Nov 25, 2012, 02:47 PM
    This trick still works. Was able to reset my thermostat after battery change.
    Thanks!
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #16

    Nov 25, 2012, 05:12 PM
    You might also find that shorting the battery contacts with the batteries out will also work. Install the batteries quickly as if they are a switch.
    raisel's Avatar
    raisel Posts: 1, Reputation: 1
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    #17

    Dec 17, 2012, 06:44 PM
    I was losing my mind with confusion. That was so simple. Who would know that?

    Thank you!!
    DJA's Avatar
    DJA Posts: 1, Reputation: 1
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    #18

    Dec 29, 2012, 08:04 PM
    Reversing batteries worked! Many thanks for the great advice!
    louischan99's Avatar
    louischan99 Posts: 1, Reputation: 1
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    #19

    Jan 15, 2013, 07:38 PM
    fullwit, you rock :)
    Thank you very much.
    bluescoot's Avatar
    bluescoot Posts: 1, Reputation: 1
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    #20

    Jan 26, 2013, 02:07 PM
    Quote Originally Posted by fullwit View Post
    The older models do not have a reset battery so this is what I did to reproduce a reset.

    Remove the old batteries.
    Install the new batteries with incorrectly facing terminals. (+ goes to - and - goes to +). This will completely power off the unit.
    Remove the incorrectly installed batteries and let the unit sit for about 15 seconds.
    Install the new batteries correctly - the unit should now start flashing 12:00 time - you're all set!
    Set the time and date and you're ready to roll.

    Hope this helps someone!
    Thank you fullwit
    You da man!

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