Question about Honeywell Programmable Thermostat Heater

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Low battery indicator

How do i change the battery thanks

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Which tstat is it?

Posted on Mar 09, 2009

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Check ur user guide book and follow the prompt and instruction how to change battery

Posted on Mar 07, 2009

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My thermostat has a low battery indicator that will not turn off. I have changed batteries several times and there is no change. The furnace still puts out heat but I can't change the settings at all. We...


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My beutler 800 said lo bat we replaced them and still reads bat lo


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


First, replace the batteries with a new set of AA alkaline batteries. If you insert the new batteries within 20 to 30 seconds of removing the old ones, you will not have to reprogram the thermostat. If the bAt Lo indication does not clear itself once new batteries are placed in the device install the batteries backward for 5 seconds, take them out, and reinstall correctly.

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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1 Answer

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Found the manual online and it said to put the batteries in backwards for at least 5 seconds to re-set the thermostat. Amazingly, this worked.

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Flashing battery symbol


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.

Jan 31, 2009 | Honeywell Programmable Thermostat Heater

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