The heat was on just fine and then all of a sudden it got cold, checked the thermostat and the screen was blank like the power was out. HELP!! I AM COLD!!

Make sure power is on to the unit.

If the thermostat is battery operated check the batterys.

It is possible there is a fuse in your unit so you can check for that. NOTE before you go playing in the electric for a fuse I suggest you turn off the power so you do not get hurt.

Merry Christmas.

You can try looking for a kicked breaker or blown fuse in circuit board,, but possible a bad transformer