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Honeywell ST7100 control unit had a flashing battery light. Replaced batteries unit not come back on

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Your thermostat may have to be set up for operation again.

Posted on Dec 01, 2016

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How to change battery on honeywell st7100 and what type of battery do they use. thanks


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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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