e04de9a7_cess_ATM___Hyosung_Error_Codes__Resolution
[Code] 20003 [Description] Reject Bin is Full [Resolution] 
Empty reject bin – if bin is empty, do a Cassette Total (from the settlement menu) – If that doesn’t help then check that AP, BIOS and CDU ROM versions are compatible.
Access ATM » Hyosung Error Codes