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You may have blown the low voltage fuse on the board in the furnace. If you have a wire connected to the C terminal on the thermostat, go to the furnace and remove the panels. Gain access to the board where all the wires attach. Locate the slot fuse on the board...CLICK HERE...if your fuse is good and you only have 8 volts from there check the wiring to the thermostat you may have a break or you may just have a defective thermostat.
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OK no problem