My garage door opener will open but not close. It will only close if you hold your finger on the button the entire time. Otherwise it goes 2 inches down, then stops, backs up, and flashes the light bulbs on and off. Same behavior whether you are using the wall button or the remote.
The infrared electronic "eyes" installed at the base of the door can see each other ok, no obstructions, and both green led's are on.
I have oiled all hinges with WD-40 as manual suggests.
I have tried increasing the downward force with the knob located on the unit but same result even it I max it out. I've also tried adjusting the downward limiter.
The door is aluminum, two car garage type.
This opener was new in August of 1995 and worked fine for 9 years, then suddenly this cropped up.
Here is the specs on it:
Sears/Craftsman (says "Sears Best" ha ha) Volts: 120 Amp: 5.0 Hz: 60 Model: 139.536415RT
Thanks for any help.