Chamberlain ATS Owner's Manual page 28

Having a Problem? (Continued)
10. The door reverses for no apparent reason and opener
lights don't blink:
• Is something obstructing the door? Pull the emergency
release handle. Operate the door manually. If it is
unbalanced or binding, call a trained door systems
technician.
• Clear any ice or snow from the garage fl oor area where
the door closes.
• Review Adjustment Step 2.
• If door reverses in the fully closed position, decrease
the travel limits (Adjustment Step 1).
Repeat safety reverse test after adjustments to force or
travel limits. The need for occasional adjustment of the
force and limit settings is normal. Weather conditions in
particular can affect door travel.
11. 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 10.
12. The opener lights don't turn on:
• Replace the light bulbs (75 watts maximum). Use a
standard neck garage door opener bulb if regular bulb
burns out.
13. The opener lights don't turn off:
• Is the Light feature on? Turn it off.
14. The opener strains or maximum force is needed 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 trolley. 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. Do not increase the
force to operate the opener.
15. The opener motor hums briefl y, then won't work:
• The garage door springs may be broken. See above.
• If the problem occurs on the fi rst operation of the
opener, door may be locked. Disable the door lock.
Repeat the safety reverse test after the adjustment is
complete.
16. The opener won't operate due to power failure:
• Use the emergency release handle to disconnect the
trolley. The door can be opened and closed manually.
When power is restored, press the Door Control push
bar and trolley will automatically reconnect (unless
trolley is in lockout position). See page 25.
• The Outside Quick Release accessory (for use on
garages with no service door) disconnects the trolley
from outside the garage in case of power failure.
17. The chain droops or sags:
• It is normal for the chain to droop slightly in the closed
door position. Use the emergency release rope and
handle to disconnect the trolley. If the chain returns to
the normal height when the trolley is disengaged, and
the door reverses on a 2x4 laid fl at, no adjustments
are needed. (See page 7.)
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