On Jun 10, 9:38*am, wrote:
On Jun 10, 9:10*am, dpb wrote:

jamesgangnc wrote:

...

... occasionally I found the door reversing during the close
operation. After each failure, I checked for obstructions and never
could find one, much less duplicate the reversing problem. It just
happened perhaps one time in twenty!!
...
Older opens that did not have the optical obstruction sensors on the
floor often had a load sensor in the unit. *There may be some
adjustors on the unit.

AFAIK still do? *At least the one I just installed does; can't imagine
would design without it.

I agree. *Every modern one I have seen has both force limit sensors
and the optical sensors. * I believe both are required. * However,
given that it reverses on the way down, it may not be the force
sensor, because you would think with not enough spring tension it
would fail to open instead of close. *But I would fix what you know
for sure is wrong first. * And that is that the door is not properly
balanced and the tension needs to be adjusted. *It may turn out that
something else is wrong, like it binds at some point, etc, but with
any door opener, the door needs to be reasonably balanced as a
starting point.





Anyway, the intermittent and the mention of the IR sensor reminded me --
had a loose piece of material hanging that occasionally would interrupt
the beam once't upon a time--took a while to realize what that problem
actually was also because it was intermittent and wouldn't perform on
demand, either...

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I think that's pretty much the advice I gave. Make sure the door
operates well manually. Then test and check the adjustments on the
opener. What an opener with the optical sensors has or doesn't have
isn't really germane to the problem he's having. He doesn't have
optical sensors, he made that clear in his second post.