8500 Manual
Page 32
...hums briefly, then won 't operate due to power failure: • Manually open the power door lock. • Use the emergency release handle to the jackshaft. Power lock makes noise when operating. • Call LiftMaster® dealer for this product. See above. • If the problem occurs on...operation: • Some minor movement is not visibly moving up to disconnect the door. If it does not, disconnect the garage door opener and call a trained door systems technician. Close the door and use the emergency release handle to 20 times without power. The door ...
...hums briefly, then won 't operate due to power failure: • Manually open the power door lock. • Use the emergency release handle to the jackshaft. Power lock makes noise when operating. • Call LiftMaster® dealer for this product. See above. • If the problem occurs on...operation: • Some minor movement is not visibly moving up to disconnect the door. If it does not, disconnect the garage door opener and call a trained door systems technician. Close the door and use the emergency release handle to 20 times without power. The door ...