For those that purchased a trailer with the ETI installed keyless door lock, I came across an issue today with our used 21NE. Since it was new to me, I didn’t realize the deadbolt wasn’t engaging and locking the door fully. When it was locking, it gave me a long beep and a red light after, which I had thought meant it successfully locked the door. Nope! The deadbolt was only extending about half way, and the long beep/red light means something went wrong. It pays to read the instructions.
I swapped out the batteries, thinking maybe it was just underpowered. That didn’t fix it. I took the latch off the interior side (4 machine screws) and squirted some silicone lubricant inside where the latch pin sticks out, then manually engaged the deadbolt back and forth a bunch of times. That did the trick. Works like a charm now. Also: the code default when you take the batteries out is 3715. Manual is attached.
Edit: you know when the lock engages properly because it will give you two short beeps and a green light.
So if you are having issues with the deadbolt not extending fully, try some lubricant in the internal mechanism. This is what I used (which also works on squeaky bathroom door hinges):
4-oz All-temperature Silicone Drip Oil
https://www.lowes.com/pd/3-IN-ONE-Al...icant/50370414