I have a chamberlain 5580 operator it sounds like motors jambed
I have a chamberlain 5580 operator and when i press the bell push it just humbs like the motor is jambed
Building Materials - Sears - LiftMaster - Craftsman LiftMaster Chamberlain Garage Door Opener Wireless...
Answers & Comments
If the motor is stuck in the open position the trolley may be jammed against a bolt just in front of the motor unit. If so, loosen the chain enough that the tension is taken off the trolley and then run the opener until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover and then tighten the chain.
If the door is not in the open position you may have a bad start capacitor.