Since you indicate that two remotes do not work, I am guessing the receiver on the opener is the problem. Verify that connections to the terminals (located where the wires from your hardline buttons are connected) are intact.
SOURCE: Garage Door Remote Not Working Consistently
Lift Master Security Plus remote works only intermitenly, It seems to lock after a few tries, Works from inside garage, Seems to lock up after few tries, Wall opener fine. Changed batteries several times. Can't understand why it works and then doesn't. Tried cleaning sensors and wires,
SOURCE: remotes quit working for garage door
I had the same problem with my Craftsman opener but different model. However to fix this I simply followed the instructions that came with the opener and reprogramed the remote to the opener. The instructions are in your owners manual and are pretty straight forward.. John
SOURCE: Garage door opener remote won't work
meerkat1 your receiver has quit working which is part of the logic board. The logic board runs around $80.00 for the part alone. Might be time to get a new opener.
SOURCE: my remote quit working. part # 139.53681B. I
the remote that does not work is probably bad.orrr it might need the code reset to match the 1 that works..
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