A merchant can report seeing a "Critical Error Code 06" at the beginning of processing or after settling a batch.  This is not to be confused with an Authorization Response Code 06. 

Symptoms

• At the beginning of processing or after settling a batch, the screen reads "Critical Error Code 06"

Causes

• Unknown, software or hardware bug

Resolution

• Advise merchant to NOT PRESS ANY BUTTONS
  • If the merchant pressed the red X button, they will be taken to the Program Manager Screen. Merchant can inadvertently remove THE ENTIRE PROGRAM from this screen. 
    Device will need replacement if this happens
• Perform Power cycle
  • Remove power from device
  • Wait 5 seconds
  • Reconnect the power