User Manual

35
Troubleshooting (Continued)
Troubleshooting (continued)
The garage door opener motor hums briefly, then won't work:
• The garage door springs may be broken. See above.
• If the problem occurs on the first operation of the garage door opener, door may be locked. Disable the power door
lock.
The garage door opener won't 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.
Door loses limits.
• Collar not tightened securely. Tighten collar (see Assembly Steps 1 and 2 on pages 9 and 10) and reprogram
limits (see Adjustment Step 1 on page 22).
The garage door opener 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 opener is mounted at a right angle to the jackshaft. If not, move the position of the mounting bracket.
Power lock makes noise when operating.
• Call Chamberlain
®
for replacement power lock.