I was having similar issues with mine. My camp side landing gear leg did the same thing as your middle jack...internal screw mechanism broke. I replaced the leg and all has been good since.
Here is what I learned after much headache and troubleshooting:
Batteries must have a full charge to properly operate. Make sure they are the right size too. I had group 24 originally installed by dealer instead of group 27.
When the system struggles due to low voltage or high amp draw due to a sticky or bad leg, the LF error comes up because it’s first in line in the wiring.
There’s a second hidden auto reset breaker in line with the main reset breaker that trips and causes the error. (Look behind the false wall above the batteries on top shelf). I removed it because is was a lower amp rating than the main and they were wired to each other.
Always try to get the trailer as close to level as possible before using the level up. I use the Anderson knockoffs by camco that I drive the trailer tires onto to level side to side.
Use blocks under each jack to lessen the distance of jack travel (stroke)
You’re going to need to replace your jacks (which isn’t difficult)
Good luck
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2016 North Point 377 RLBH, with a few mods, disc brakes, shocks, Sailun g rated tires, wet bolts
2014 Ford F350 Platinum sold
2017 Ford F350 Lariat, CC, 6.7PSD, DRW, Trailer Saver BD3 hitch
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