Hi I removed the thermostat from the wall and found the short right there. Not sure if this is a new tt? If you can't find it make an appointment right away with the dealer to have it fixed. Don't let them tell you to bring the tt in and they will work on it when they get chance you will not see the tt for weeks! The white wire is used to start the furnace. Remove the white wire from the back of the thermostat and turn the furnace back on. If the furnace starts it still is shorted out. I would then go out to the furnace and take the white wire off the control board and see if it starts. If it dose then the control board is bad. if it dose not then the wire from the thermostat has been pinched and shorted out and will need to be replaced.
PS you can use an electric heater 1500 watts for heat at night this summer with park power
Hope this helps Tim