I have a Liftmaster 1255R - "The Professional Line 1/2 HP Security +" opener. It has a red square program button on the back and was mfg 11/97. As this was so close to 1998 and after research most places said that the 888LM will work with the 1255R I called Liftmaster customer service to confirm. They said since the part number was a "41A5021-1B" it would work with my opener.
After ordering a retro fit kit, and trying to get the 888LM to work, it does the slow blink/beep and will not work with my opener. I have made sure the security eyes are working, tested the voltage at the opener and at the wall (same in both places, I believe 24.6v or 26.4v, dont remember which) and am now out of ideas.
It is definitely very frustrating as its not very easy to return ! (open box, shipping back, etc). Is there anything else I can do? Very frustrated as I verified if it would work and was told yes.
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I have a 2000SDR "The Professional Line 1/2 HP Security +" opener manufactured in August 99 and am having same issues. I have just found out it is one of 4 listed as incompatible and I need a new logic board to fix the problem
http://iscwest2016.academy-alarm.com/wp-content/uploads/2016/04/Garage_Door_Product_-Summary.pdf
https://myqcommunity.liftmaster.com/liftmastermyq/topics/my-888-lm-timed-door-close-feature-opens-my... -
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