There are 3 unrecoverable errors on the CR-25/CR-55 and CR-180 scanners.
1. Canon API can not find a scanner attached
Error string: "CSD_NODEVICE"
Exception Type: TransportExceptionDeviceError
Exception Device: TransportExceptionDeviceTransport
2. Canon API reports that a hardware error has occurred
Error string: "CSD_HARDERROR"
Exception Type: TransportExceptionDeviceError
Exception Device: TransportExceptionDeviceTransport
3. Canon API reports that no ink cartridge is installed but endorsing is enabled
Error string: "CSD_NOCARTRIDGE"
Exception Type: TransportExceptionEndorserInkCartridgeMissing
Exception Device: TransportExceptionDeviceRearEndorser