I HAVE THREE MACHINE FRESENIOUS MODAL 4008S
ALL THIS MACHINE GIVEN NOVARAM DURING RINES SAME TIMES WHEN TURN THE MACHINE ON SAME TIMES DURING TEST& DAILYSIS TREATMEANT ITRY TO SOLVE IREPLACE CPU1&CPU2&RESET NOVARAM AND RECALIBRAION THE MACHINE BUT THE PROBLEM STILL

Novrams store your set calibrations. Your battery ram is bad.

Replace the power supply unit and then reset the NOVRAM , recalibrate the unit and try again.If it is coming again replace NOVRAM, reset and recalibrate the unit.