"My Craftsman 1/2 HP garage door opener safety sensors work for objects in the way of the beam BUT it doesn't turn the light on anymore when the beam is broken. Model # is 139.53675SRT1
I know how important it is to have your garage door working properly at al times. I researched your question and found a link with helpful information on this issue. I attached the link below. I hope this helps.
To have your lights come on automatically when you walk into an open garage, you must START with the lights ON. If you don't want that feature and you want to turn it off, you must START with the lights OFF. To turn the feature on, turn the lights on manually with the wall switch, then press and hold the LIGHT button for about 10 seconds until the motor unit light bulbs flash. Now, if the light bulbs are on, manually turn them out and then walk out through the open door. The light bulbs should come on. To disable this feature, start with the light bulbs OFF and everything else is the same.
Thank you for your question on why the light will no come on when the beam is broken.
The door has to open for the beam to turn the work light on the opener.There should be a feature on your opener so you can turn that feature off and on. Don has given you the process for activating and deactivating this feature on the opener.Please let us know if it worked for you.Sam A.Member
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