So my Honeywell non WiFi Thermostat was working fine except for the low battery signal in the top right-hand corner. We took the face off of the thermostat of course shutting the Heat and fan off before doing so replace the batteries and it seems to be working wonderful as far as the lights turning on and all the options working but now the heat will not go on and it is close to 55 degrees in my house and going to do nothing but drop for the rest of the night. Any suggestions? Help me please? Getting cold

  • 1
    try turning everything off and back on.
    – dandavis
    Nov 18, 2017 at 13:08
  • What happens when you jumper R and W at the thermostat base? Nov 18, 2017 at 16:09
  • I tried on and off a few times, no heat Nov 18, 2017 at 19:39
  • Three-phase idk what that means, how do I do it? Nov 18, 2017 at 19:39
  • 1
    Are you using rechargeable batteries? They provide about 1.2v, whereas alkalines and lithiums provide about 1.5v.
    – isherwood
    May 17, 2019 at 13:05

1 Answer 1


Depending on the model there is sometimes a very small reset button that needs to be pushed after the batteries are changed. Usually about 1/16” round. Not all thermostats have this though. It would be under the cover somewhere. I have also had similar problems with cheap batteries particularly Costco Kirkland batteries even brand new. I have never had problems with Duracell or Energizer

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