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My honeywell a/c not coming on.just replaced batteries

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Check breakers to furnace

Posted on Aug 10, 2008

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Heat not coming on. battery died.


Please go to the link and check graph "2.5 Installing the Batteries". Its really easy so it should be a piece of cake.https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1800.pdf

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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

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First try replacing the batteries. I have a slightly diff honeywell model and it takes 2 "AAA" batteries. The battery holder comes out the side of the unit, just press where it says press and pull out.

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How do i set an apartment honeywell thermostat ? it is programmable but i cannot figure out how to set it at a comfortable temp. i must have done something wrong because it continues to come on even...


remove the batteries and turn beakers off to system air handler or furnace. Wait till screen clears so that T-stat will reset. Then re-install batteries and turn breakers to on.

Apr 29, 2011 | Honeywell Air Conditioners

1 Answer

Honeywell DT200 thermostat is not responding to any buttons pressed. Display is showing small flame icon on left of screen and what looks like a battery in top right hand corner. Any suggestions?


The thermostat is calling for heat, and the battery icon means that the batteries are low and should be replaced. If the thermostat is wired to run on battery power alone, replacing the batteries usually corrects this problem. Hope this helps! Jim

Jan 29, 2011 | Honeywell Air Conditioners

1 Answer

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 | Air Conditioners

    1 Answer

    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 Air Conditioners

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    Replace battery


    Yes, the battery must be replaced. Gently lift or pull of cover, the battery compartment is there. Best of wishes.

    Jun 15, 2009 | Honeywell ER150B Air Conditioner

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    My clock on my honeywell smartfit has frozen now the system will not work is it repairable


    Before replacing the unit try replacing the batteries. After you replace the batteries push the run program button and see if the system comes back to life:)

    Jun 27, 2008 | Air Conditioners

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