Mode jumper has been overridden

The error message CPPEA20 appears when the mode jumper has been overridden. This is due to cache data that is in a conflicting mode.

1. To begin correcting this error, examine the mode jumpers in the rear section of the storage I/O card.
   Note:
   The mode jumper is accessible without requiring the removal of the I/O card.
2. Choose from the following options:
   • If the mode jumper is not in the desired position, follow the steps in Setting or changing the mode of an I/O card.
   • If the mode jumper is in the desired position and any other I/O card or device reference codes occurred at about the same time as this error, contact your service representative.
   • If the mode jumper is in the desired position and no other I/O card or device reference codes occurred at about the same time as this error, then power the system down normally and IPL. See Powering on and powering off. This ends the procedure.