Please confirm the error. My documentation only has 50.1, 50.2 and 50.3 and does not have an error of 50-7. Take a picture of the menu and post as attachment so I can see exactly what you are getting. If any connections will the the problem, they will be to the dc controller on the right side when looking at the rear. You have to be careful that each cable is fully seated in each connection. I have had many where the connection looks fine but the connector was not fully pushed in. Take a picture of the dc controller with the cables connected and post so I can see if any are missing. Sometimes one cable get stuck behind and does not get connected.
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