Cheap Craftsman 1/2hp opener. Very basic but always worked fine. Earlier this week the wife complained that the opener wouldn’t work with the touch of one button - but rather had to hold the button down, both inside and remote. Opener not flashing which indicates it’s not the safety beams. I set the manual release and ran the door up and down by hand several times - very smooth with no binding. Opener operates no problem with the door disconnected. Reconnect the door and now the opener won’t operate more than a couple feet before stopping and running back to full open. I climb up on a ladder and look at track and the shuttle, all seems fine.
I climbed up on top to watch the drive sprocket run - seems very jerky and uneven. Cleaned, lubed, and adjusted the entire chain and greased the track just to be sure. No change. Now motor will not go up and down regardless if the door is connected or not.
I’m about ready to chuck the whole opener and install a new one - but anything to check beforehand?