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Honeywell thermostat blank screen after battery replacement

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Check polarity

Posted on May 05, 2017

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Thermostat is not coming on we are in san antonio is there help out there for us


Reasons for a Blank Screen on a Honeywell Thermostat ...

homeguides.sfgate.com > ... > Real Estate Rental & Lease Basics
Honeywell and other brands of programmable thermostats typically show a blank ...and the batteries can no longer provide power to the screen, it will go blank. ...electrical system, a blank screen indicates there is no power going to the unit, ...

programmable thermostat troubleshoot - YouTube

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Programmable thermostat started to fail and behave erratically after being in service for a few ... My thermostat works but the remotes have stopped working. .... Honeywell CM907 Digital Programmable Room Thermostat user ...

HEAT WON'T TURN ON How Test if your Thermostat is ...

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Heater fails to turn on it does not mean you have a faulty heating system ... 4th - Check programming on a programmable

Jan 10, 2016 | Honeywell Programmable Thermostat Heater

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 | Heating & Cooling

    1 Answer

    The thermostat worked correctly for months then


    Go to honeywell.com
    Under red welcome sign
    Bottom red highlighted box literature/image search
    Type in thermostat model number
    Click on arrow to right
    Then click on the PDF files owners manual / installation instructions
    If you can’t find what you want, the bottom left and bottom of web
    Page, they have homeowners assistance and Home products to get the help you need

    May 10, 2010 | Honeywell Programmable Thermostat Heater

    1 Answer

    The screen went blank and there doesn't seem a place to replace battery


    There doesn't seem to be a battery in that model. Supposed to be permanent memory. You can download a PDF manual at this site if you need it.

    http://www.honeywell-thermostat.com/honeywell/RS-9420.html

    May 05, 2010 | Shaw Robert RS-9420 Thermostat

    1 Answer

    Honeywell thermostat t8400c intermittent blank screen


    It actually sounds like the batteries are going dead if the 24v from the furnace are not providing the power to the thermostat.

    Sep 28, 2009 | Honeywell Electronic Programmable...

    2 Answers

    A/C not turning on - Digital screen is blank


    Your honeywell should have battery back up but the primary power for this is a 24 volt transformer located in the air handler probably in your attic. All these controls run on 24 volts

    Jul 11, 2009 | Honeywell Programmable Thermostat Heater

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