The thermostat get's it's 12 VDC operating power from the furnace. There is an On/Off/Reset switch that if off/tripped will prevent power going to the thermostat but I believe it is more likely you may have blown the fuse that provides the 12 VDC to the furnace. That's the first place I would look.
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Ted & Melinda
2016 ACE 27.1
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