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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Is this a Lippert HappiJac version? See the attached link for a copy of that troubleshooting manual. If you have a small digital meter this is easier to trouble shoot. It might be a bad control module or just a loose connection. Print this out so you have it. http://happijac.com/images/pdfs/Bed-Lift%20User%20Manual2012.pdf
Just checking back in to see if you were able to resolve this issue or do you still need some additional input on the solution from me here?