Okay I thought I would be helpful today as the wifey when I noticed that our battery light was blinking on our honeywell thermostat. So I went to town and purchased some new batteries and came home and put them in. As soon as I put them in... the LED or LCD (or whatever it is) display went blank and the thermostat would not work. I was talking to my son and he said, "see if there is a reset button"...well didn't find that but did notice when I took a kitchen table knife and put it in between the two batteries the display came back on and it would work, but as soon as I take it away it is blank again. connection problem with the batteries? I am sure hubby will know , but I am just wondering. Thank you!
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You might have some thermostat wires that are touching meaning the insulation has been broke off and getting a direct short. Check the wiring going to the outside unit and replace any wire that is in bad shape. let me know okay. Ken
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.
there are currently 60 honeywell thermostats made i have no idea witch one you have , but a lot of the new ones run on batterys you might be seeing a low battery signal . look for a door where batterys might be and replace them
I have had the same problem- twice. It was a similar but different problem each time. The -AC means the ac control voltage isnt making it to the thermostat. In my case both times it was a switch in the control circuit that wasn't closing properly. The easiest was the front cover switch. If the front cover is removed from the furnace or has vibrated loose, the switch will open, preventing the furnace from running. The other instance I ran into was a flow switch on the exhaust blower which ensures the there is flow OUT the chimney. The switch wasn't functioning, so the furnace wouldn't start. The blower would come on for a short time, but the burners wouldn't light.