Err3 error on the OP-901. This should help with a scale when placing the weight goes from 0 to increasing negative number until it reaches UUUUU. This is caused by the OP-901 indicator going too far negative and giving the error. If you don't have the C39 setting / using an OP-900/902 you would need to swap the green and white cable.
This will swap the positive and negative signal internally or re solder the green and white cable if your indicator doesn't have C39 setting.
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