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When you replaced the batteries did you unhook the positive for both batteries before unhooking the negatives? And then when you installed the new batteries did you plug in the negatives first followed by the positive terminals? I did not follow this procedure correctly and destroyed the circuit board. What are the actual error codes you are getting? You may have to move the unit up to the top charging point manually. I have had to do that several times. I’m not impressed with the reliability of these units!