Warning W31: Cartridge low Warning W32: Battery low Warning W33: Invalid time/date Warning W34: End of warranty Warning W36: TBR canceled Warning W38: Bolus canceled Warning W39: Loantime warning Maintenance M20: Cartridge not inserted Maintenance M21: Cartridge empty Maintenance M22: Battery empty Maintenance M23: Automatic off Maintenance M24: Occlusion Maintenance M25: Loantime over - end of operation Maintenance M26: Cartridge change not completed Maintenance M27: Data download failed Maintenance M28: Pause mode timeout Maintenance M29: Battery type not set Maintenance M30: Cartridge type not set Error E6: Mechanical error Error E7: Electronic error Error E10: Rewind error Error E13: Language error