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How to change the battery on my thermostat Honeywell t8001c

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The battery is inside the thermostat. There should be screws / or / it will just pry off the mounting base (not the wall). There are usually rechargable batteries inside.

Posted on Apr 28, 2008

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I couldn't figure out how to amend my last question, so here is one more piece of information. I just put batteries back in and reset the time/date. The Temp Up and Temp Down buttons WORK FINE


your thermostat may be locked go to honeywell web site punch in thermostat model # and look for set up pushing two button at the same time gets you in but you will need instuctions for set up

Jan 31, 2015 | Honeywell RTH230B 5-2 Day Programmable...

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My Honeywell thermostat keeps flashing the battery icon even after I changed the batteries. It will not kick on my heater why?


The replacement batteries may have been installed incorrectly or the replacement batteries may be defective

Feb 07, 2013 | Honeywell Rth110b Horizontal Digital...

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The thermostat for the main zone in my house (honeywell model RTH5100B1017) is battery powered and it blinked change the battery for a couple of daye and then went blank. I have changed the batteries twice...


  • Check any batteries and replace if needed. Ensure that you use only AA alkaline, nonrechargeable batteries.
  • 2 Check for oxidation buildup on battery contacts. Use electrical contact cleaner and carefully clean the battery contacts of any oxidation buildup.
  • 3 Reset the system switch.


  • Read more: How to Troubleshoot Honeywell Thermostats ' eHow.com http://www.ehow.com/how_6596826_troubleshoot-honeywell-thermostats.html#ixzz17aWIl2Xt

    Dec 09, 2010 | Heating & Cooling

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    How can I unlock this th


    Remove the thermostat from its base and replace the batteries. To remove the thermostat, grasp it at the edges and pull toward you. The batteries are on the back of the thermostat housing.

    Read more: How do I Unlock the Digital Display on a Honeywell RTH8500 Thermostat? ' eHow.com http://www.ehow.com/how_7267447_do-display-honeywell-rth8500-thermostat_.html#ixzz17KTxLwBU

    Dec 05, 2010 | Honeywell Heating & Cooling

    1 Answer

    I changed the batteries of the Honeywell thermostat and on the screen it still shows low battery.


    Hello my name is Heath it will be my pleasure to assist you. Take the new batteries out and let the display go completely blank then reinstall the new batteries and the lo batt light should go off.

    Nov 08, 2010 | Honeywell Heating & Cooling

    1 Answer

    Thermostat message battery low. Put in two new batteries and it will not reset or start. Lost Power during storm and cannot get it going again.


    Let me see if I understand your question.. your thermostat indicated the batteries needed to be replaced so you changed them with new ones.. With new batteries, you cannot get your thermostat to initialize or program correctly and as a result of that, you cannot get your AC system to start up.. If that is true, please provide the Honeywell Model # and verify the batteries you installed were Ok,...
    Will attempt to assist once you've provided this info..

    ( on an off chance, have you checked the fuse or cuircuit breaker for your AC system to make sure it has power available?) This is especially important after a power outage..

    Sep 16, 2008 | Honeywell Heating & Cooling

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