Sears Opener Keeps Opening
My Sears Craftsman 1/2HP Opener is an old Model (#139.664002) without electric eyes. It recently refused to stay in the closed position - dutifully opening when triggered either by pushing both wall buttons or by using the remote. It closes until impacting the floor then switches direction operating until fully raised.
I've read a good many summer posts & responses, not quite seeing a similar explanation. Springs look good, traveler is not obstructed, visible wiring appears in good condition, rollers are greased. Ideas on trouble-shooting this symptom?