Having a Problem? (Continued)

9.The door reverses for no apparent reason and opener lights blink for 5 seconds after reversing:

•Check the safety reversing sensor. Remove any obstruction or align the receiving eye. See Installation Step 9.

10. The opener strains to operate door:

•The door may be out of balance or the springs may be broken. Close the door and use the emergency release handle to disconnect the door. Open and close the door manually. A properly balanced door will stay in any point of travel while being supported entirely by its springs. If it does not, disconnect the opener and call a trained door systems technician.

11. The opener motor hums briefly, then will not work:

•The garage door springs may be broken. See above.

•If the problem occurs on the first operation of the opener, door may be locked. Disable the power door lock.

12. The opener will not operate due to power failure:

•Manually open the power door lock.

•Use the emergency release handle to disconnect the door. The door can be opened and closed manually. When power is restored, pull manual release a second time.

•If a Standby Power Unit is connected, the opener should be able to operate up to 20 times without power.

13. Door loses limits.

•Collar not tightened securely. Tighten collar (see Assembly Steps 1 and 2) and reprogram limits (see Adjustment Step 1).

14. The operator moves when the door is in operation:

•Some minor movement is normal for this product. If it is excessive the collar will wear prematurely.

•Check to make sure the torsion bar is not moving left/right excessively.

•Check to make sure the torsion bar is not visibly moving up and down as it rotates.

•Check that the operator is mounted at a right angle to the jackshaft. If not, move the position of the mounting bracket.

15. Power lock makes noise when operating.

•Call Liftmaster® dealer for replacement power lock.

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