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There should be a couple of AAA batts in it. Grab all 4 corners and pull straight out & off the mounting plate. If no batteries are installed it is hard wired & the problem is at the air handler(blown blade fuse or open transformer winding). When you reinstall batteries make sure there is no corrosion. And careful when you put the tstat back onto the base. There are some small pins that need to align with its holes/terminals. Honeywell has a great 1-800 support #. Should be on the tstat.
The thermostat, depending on the model, normally does not get powered by batteries, they are for backup power. You might be losing 24 volt from the furnace, causing the thermostat to run on batteries.
Here is a simple way to tell. Remove your thermostat from it's mounting plate, locate the wiring, the red and white are low voltage control wires. Disconnect them from the base and join the two together if the furnace runs you need a thermostat if not it is in the controls to the furnace.
I would say that you have one of two issues. Either your thermostat is bad or you do not have 24v coming from the heating unit. In this case the problem would be in the low voltage circuit of the heater. At the heater you should have 24v AC when you place an electric meter across the R terminal and the C or W terminal. If you have no vaoltage across the R to either the C or W then you have a bad transformer or a blown fuse in the furnace. If you do have voltage ther and also at the t-stat then the t-stat has gone bad, replace it.
This unit doesn't require a battery. It runs off the 24v from the unit. Check that your transformer is still working. Check the control board for 24v pwr. and main pwr. Check your breaker to the unit. It could be as simple as a bad stat too. You can check by using a jumper wire and jumping across from r term. to y term.
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