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If furnace is not coming on, there should be an error light flashing on the control board in blower compartment to indicate what has failed. If you can locate this and tell me the pattern of the flash, that will point us in the right direction for troubleshooting.
Also let me know if you have a multi meter for troubleshooting.WE will go from here.
Turn thermostat to call for heat and tell me what light does and if small vent motor where vent connects comes on.
Can you do some hands on?
Either at thermostat or furnace board. Jump the R and W wire where thermostat wires connect and see if furnace will come on.
I sent a picture. Connect them together. If you do not have a pair of needle nose pliers or a jumper, go to thermostat, loosen red and white wires and move the white over to red along with red.
Don't mess with others, just get the red and white together.
OK now with them touching tell me what happens at furnace
Ok lets go do same thing at furnace board. Now on furnace board we want to actually jump terminals on the board itself.
Still nothing from furnace and light solid?
OK look on furnace control board and see if there is a small purple fuse,if so remove it and see if it is blown
From here we will need a volt meter to see if we are getting voltage from transformer to board and voltage to vent motor.
You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.
No Walmart close by that is open 24hrs?
If interested, I will be happy to wait, but since we are not getting any response from furnace when directly bypassing thermostat at board,it is likely you are going to need a part any way.