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Had the same issue with my 3120. It is a board that is bad in the unit. Mine did not work at PDI when I picked it up. Dealer had to order part, and I took it back for them to fix it. It now works.
Paul
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Paul & Erika
2020 F-350 6.7 PSD crewcab DRW, Reese 27k M5 hitch, 2021 Keystone Montana 3120RL Legacy
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