Chamberlain 1000SD 1/3 HP Owners Manual page 31

Situation
The door opens but
won't close:
The door reverses for no
apparent reason and
opener lights don't
blink:
The door reverses for no
apparent reason and
opener lights blink for
5 seconds after
reversing:
The opener lights...
The opener strains or
maximum force is
needed to operate door:
The opener motor
hums briefly, then
won't work:
The opener won't
operate due to power
failure:
Having a Problem?
Probable Cause & Solution
Repeat the safety reverse test after the adjustment is complete.
fully closed
Repeat the 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.
don't turn on:
don't turn off:
on
increase the force to operate the opener.
door lock.
Repeat the safety reverse test after the adjustment is complete.
(continued)
standard neck
off.
Close the door
Do not
Disable the