We recently had our electric service upgraded to a 200 amp service. We now have a problem with the furnace turning on.

It will run when set on the "ON" setting on the thermostat. It will not come on when set on "AUTO"

What could be wrong with this?

Thanks!

Sandy

If it is an electric furnace usually one of the sequencers controls the blower delay on time automatically and that means that the sequencer or the item in your unit that controls the blower during the heat cycle is defective.