I have a Sears HBW0777 opener that still works despite blocking the photo eye sensors. The lights stay green even when blocked. Tried to realign, no change. One of the lights just dims a little when blocked. It's an oldie but a goodie. I installed it about 14yrs. ago. I wouldn't worry so much about this but I have young children. Thanks for any input!
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Very strange they both have the same exact problem. I would suspect something with the brackets is changing. When you are having this problem and the light on the receiver unit is not lit, tweak them a bit and see if it comes on. The odds of the logic board in both openers having the same thermal problem is just too high.
One photo eye should be yellow and the other one green. The problem seems to be your down limit to be set too far. When you stand facing the door behind the operator the limit adjustments should be on the left hand side under the light cover. The down limit is the one closest to the door.
this probably means you have a bad photo eye if you happen to have to doors side by side may be picking up on other sides photo eye just switch sides from left to right, however if the lights are coming on but does not mean that photo eye is not bad it has a small circuit board inside of it...
Some craftman operator don't have that feature. Are both photo eye lights green? Feature not available. If the photo eyes are yellow and green feature should be avilable. The operator needs to have a three button wall station. With the light on the operator off press and hold the "light" button for about a minute until the light flashes.
I assume you have a Craftsman or Liftmaster operator and you are talking about the photo eyes (sensors). If this is true thanone light will remain on if there is power to it and the other will go out when the photo eye beam is blocked or are not lined up.
Thank you for your your question bry4man. I look forward to answering any more of your questions.
You have a photo eye (sensor) issue as you suspected. Be sure both green lights are on. If one is flashing or is off, the photo eyes need to be realigned or there may be a wire shorting out (check for staples in the wire) to the photo eyes. Sunlight can also be an issue. The photo eyes might have to be moved away from the opening to be out of the sunlight.
It has the "Protector System" (safety sensors). chec the
sensor indicator light on the receivinng eye the green light had a
slight flicker.cleaned both the sending eye and receiving eye lens
of dust and cob webs, then realigned the receiving sensor for a steady
green indicator light. then check the door function it now works
fine.over time, temperature, and viberation the sensors become
dirty and get out of alignment, as no one had tampered with the sensor
alignment prior to this. Hope this works for you.