Hi Churley:
Thermostats work on a 24v system. You may have a burned out transformer or your heater may have a burned out contactor. Has the contactor been making a buzzing noise while the unit runs lately? That would be a good indicator of a burn out.
If these two attempts fail, you will need to trace the entire 24v system to find the trouble; could be a wire broken or an in-line fuse blown, etc.
Let us know how it turns out.
Glenn
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