Took delivery of a Kenmore Elite HE3 electric dryer yesterday. Tried to dry my first load this morning and can't get it to start. All the lights are functional, the door is closed tightly (cliccks, I can change the Options and Modifiers but when I press the start button all I get is 3 beeps but no error messages. Relatively new home, power is adequate... I'm baffled. Any suggestions?