98bf30f6_cess_ATM___Hyosung_Error_Codes__Description
[Code] 20004 [Resolution] This error occurs when the circuit between the mainboard and the door switch is open. Check vault door switch. This white plunger switch is located in the upper left corner of the vault, or on along the front edge of the cash dispenser tray. Also check that black and white, 2 wire connector is properly connected at rear of main board. Move the vault switch forward to aid door clearance problems. Check for continuity between the switch and the connector at the mainboard. [Description] 
Vault Door is Open
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Description