The down stop switch may need adjusting. Also make sure it isn't
twisting the track and knocking the photo eye out of alignment.
I had a neighbor call me for this and one of the labels on the door
had come loose and was blocking the eye when the door went down.
It's kind of funny how so many people assume that all GDO's are
equipped with electric eyes these days.
I'm sure that there are millions of older models still in use. I've
I would say that the three possible problems, in no particular order,
Down Limit Adjustment
Down Force Adjustment
Electric Sensors, if so equipped
Note: If adjusting the Down Force Adjustment solves the problem, you
might want to look for a root cause, such as binding near the bottom,
etc. Something is telling the force limiter to reverse the door, so
something has probably changed in how much feedback the sensor is
I say Derby's point is valid. I have a Moore-Matic unit in my
current garage that is 24 years old and has no electric eye sensor.
I also have installed Sears units from back in the early 80s that had
no electric eye sensors. I'm sure there are pleny of other ones out
there that are still in use before the saftey reqt became mandatory.
My statement was made as a general observation, which may not fit this
particular instance. I was merely pointing out that the "electric eye"
seems to be mentioned in almost every answer to GDO questions, with
rarely a "If you have sensors..." as part of the answer. It appears
that just about everyone assumes that every GDO in use today has
My 198x Craftsman doesn't and the GDO's for the garage I store my
trailer in (GDO brands unknown) don't. It's a 2 car garage with 2
different brands of GDO's and neither of them have sensors.
My only point was that not all GDO in operation today have sensors, so
any suggestion that involves the electric eye probably should say
something like "If your model has sensors..." or "Assuming your model
Keep in mind that in many cases we are answering questions for folks
without a clue so it might save some back-and-forth if we clarify that
That's all...no biggy.
On Wed, 4 Nov 2009 11:02:03 -0800 (PST), jamesgangnc
The Sears/Craftsman openers are Liftmaster. I have one and it does not
have electric eyes. There is an adjustment for downward force
sensitivity. You adjust it by closing the door on a roll of paper
towel used to represent the family cat being squashed.
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