Today I noticed my garage door did not reverse when a 2x4 was placed under the door so I decided to adjust the travel limit. I made a slight adjustment and now the opener doesn't work at all. I changed it back which did not change the symptoms.When the button is pressed, the opener makes a humming sound for approximately 20 seconds, then stops. The chain doesn't move. Google says the trolley must be jammed on the stop bolt but as far as I can tell it's not, and the door does move freely if disengaged from the carriage.The opener is a Dura Lift 2100. Any suggestions would be appreciated. via /r/DIY https://ift.tt/2I2rGRl
