Question about Honeywell Programmable Thermostat Heater

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Flashing battery symbol

We just replaced the batteries in our Honeywell RTH230B controller.  
I did not turn off the Heat/Cool switch before removing the old and reinstalling the new batteries.
Now, with the new batteries installed, the battery icon is flashing and the controller won't turn on our pellet stove.  I checked the battery voltages and the new batteries are fresh.
Is there some type of reset button I need to press to clear the low battery error?

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I had this same problem today.  I called Honeywell and they said the flashing broken battery symbol may mean low batteries, or it may mean the battery type is incorrect.  They recommend only non-rechargeable alkaline batteries.  I was using rechargeable NiMH batteries.  Even though they were fully charged, I had the flashing battery symbol and the thermostat relay would not work.  I replaced with alkaline, the flashing battery indicator went out, the thermostat works again.
Odd that it worked for 3 months on the rechargeables after first install. I did notice the broken battery symbol came on after the first few days, but I checked the battery charges and they were good, so I disregarded the symbol until the thermostat stopped working today.  Apparently there is something about the NiMH performance characteristic that the thermostat doesn't like.

Posted on Feb 18, 2009

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Clean the contractor with pencil eraser then put batteries in backwards for 15 seconds and then reinsert them properly. This fix it for me and hopefully will work for you.

Posted on Oct 07, 2016

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