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I changed the batteries on my thermostat. I turned theunit off first, as instructed. When I installed 2 new batteries, i have no LED read out at all?

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  • Robert Dec 07, 2012

    If the led was off before you changed the batteries and changing the batteries did not help, the thermostat is not receivimg power due to a burned out transformer or a condensate safety switch is sensing the condensate line clogged

  • mary_b_cobb
    mary_b_cobb Dec 07, 2012

    I fixed it. The batteries were really tight when I removed them and I used small screw driver to wedge them out. When I did that I apparently bent the the connector out. Bent it back to make a more snug connection and all is well. Thanks for replies!

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Was the LED off before you changed the batteries?

Posted on Dec 06, 2012

  • pat arnold
    pat arnold Jan 01, 2015

    no led light is on

  • pat arnold
    pat arnold Jan 01, 2015

    sorry i carnt remember but it comes on if i switch the temperature up

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2 Suggested Answers

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Posted on Jan 02, 2017

SOURCE: Furnace not firing up...thermostat said

1) Turn the fan to on and if it runs you know that you have line
voltage to furnace and 24volts to the thermostat.

2) You could turn the furnace off remove the doors and get to the
control board. If you can find the Thermostat wires on the board
mark and remove them. If you have a typical Furnace and you
have some electrical background put a jumper wire between
terminals R and W,put the doors back on-there is a door switch
that if the panel is not put back on-it will not run. Turn your power
back on.

3) The Blower motor may come on, the induced draft blower should
come on, the glow coil should glow, the gas valve open and the
burners should come on and the unit should run.

4) If all of this happens, then you have a thermostat problem or you
have bad thermostat wires.

5) If nothing happens then you don`t have power to the furnace or the
little fuse that protects the transformer is blown.

Good Luck

Posted on Jan 08, 2010

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Please follow these steps
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The other "solution" posted here is not a solution. According to this web site: http://www.espenergy.com/faq_honeywell_thermostat.htm


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So I tried it... put the batteries in backwards. It completely reset the thermostat so I had to reprogram it (which was easy enough). One thing I did that the instructions did not specify. After I removed the batteries, I let it go completely blank before installing them backwards. Then I waited 5 seconds, pulled em out and put them back in correctly and eventually it started flashing indicating it needed to be programmed. HINT: Don't forget to set the current time!

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