After starting the fire,it will burn for up to 30 minutes,then go out,but pellets continue to feed.I've cleaned everwhere that can be accessed,so there is no ash to block airways.All the swicthes seem to be giving the proper readings when checked w/an ohmmeter.Door and ash trap gaskets are good,and damper is adjusted to factory spec. This problem started after I had to remove the auger to clear a jam (a nail got jammed in it). Stove had been a bit tempermental prior to this,but at least it would keep running. Any help would be appreciated.