I have a Kenmore model 417.84052500 that won't run. If you press any of the mode buttons the lights flash several times and it beeps. It does nothing else. Any ideas?

Unplug it, wait a few seconds, then plug it back in. See if that resets it.

XenoSapien

Check the thermal fuse on the vent housing. Unplug unit, pull one wire off it and check for continuity. If none you will have to replace. Do the same with the door switch