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Are you able to do some troubleshooting.What is model number?
OK can you open the service panel on unit and see if we have a control board with a flashing light? If o what is flash pattern?
What is pattern? how many blinks between pause or just a steady flash?
OK do this. Touch the R and W terminal together where wires from thermostat hook to board. Juse a jumper or a pair of needle nose or anything.Tell me if the small vent fan comes on and hoe far in sequence unit will go.
OK that tells us issue is not with unit but with not getting signal from thermostat. Lets replace batteries in thermostat if you haven't already.
OK lets do this. JUmp the red and white wires together at the thermostat just as we did in unit and see if it comes on.
R and W
OK but it did when you jumped R and W at furnace board, right?
OK that means there has to be a break in the wire somewhere between the theromostat and unit.
Can you trace the wire and see if perhaps there is a splice somewhere and the white wire has come loose?
Also verify you did touch the wires themselves together R and W
Do you have a meter to check continuity with?
Does it have leads?
Take R and W loose at either thermsoatat or unit and twist them together and go to the other end unit or thermostat and see if we have continuity
OK has to be a break.You will either have to find it or run a new wire
That should fix you up.
If you have further questions, please let me know.
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You should see some starts across sceren to select rating