Would not dry the clothes no hot air

I first disconnected the power, dryer vent hose, back panel, disconnected power leads to heater element. Next removed top screw to the heater box, slid the box up and away from lower mount. At this point I was able to remove 1 ea lower screw holding heater element in place. Removed heater element and installed new element. Put everything back in reverse order and started dryer. (Note: Be sure dryer door is closed prior to starting dryer)Yep, I screwed that up. It no "worky" when dryer door is open. Once the door was shut, it worked like a champ.