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It's kind of tough to tell you from 500 miles away but I'm guessing it's one of several possible things.
Take your doors off the front, there will be a switch that you need to tape down for it to run. Turn off your thermostat for 10 seconds or so and then turn it back on. go to your furnace and let me know what happens. do you see a glow after about 20 secs and does it try to light. Is the combustion motor running, it's the little motor behind the cover you will be looking at the end of it.
It's probably one of these things:
Bad transformer 110v - 24v
Combustion motor not running
thermostat bad ( batteries, not prog correctly likely)
bad igniter or flame sensor
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