Chamberlain 1/2 hp whisper drive opener stops intermittently during travel. Happens in either direction. When it stops unit will not respond for several seconds to remotes or wall unit. When it finally does respond again it may only travel a few inches and stop again or work correctly for several cycles until unit acts up again. Sensor lights are solid. I can not find any loose connections in wiring. Unit is several years old.
SOURCE: I cannot figure out, where is the button on motor
Check your manual or go on line and find out where it is.
SOURCE: The belt on my Chamberlain Whisper Drive dipping
Where the belt attaches to the trolley carriage which attaches to the door there is a black adjustment nut with a spring on it. Tighten it up more by turning it clockwise until the belt tightens up. The belt will droop a little when the door is all the way shut normally but should not during operation. If you tighten it up too much the belt will slap on the rail during operation. Make sure the spring is set on the adjustment screw too. This holds the belt tight over time. Thanks BB
SOURCE: My Chamberlain 1/2 HP Whisper Drive garage door
Check the wires to and from the sensor there is a bad wire somewhere. Good luck
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