Solar controller issue? Solar30 unit

BakoRV wrote:
We purchased an travel trailer with 2 solar panels, Solar30 controller and a trip lite 2000w inverter. On our last trip the main power cable into the battery somehow came loose and we have been having issues ever since.

Basically our controller shows no power from the battery and displays a sad face.
Where do I need to start with diagnosing this issue. The battery is charged.
I found the manual online but it does not show any troubleshooting and does not show any situation with a sad face.

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