Manufacturer's investigation conclusion: the reported event of the mpu alarming with all three lights illuminated was not confirmed.The returned mpu (serial number: (b)(6)) was received at the service depot without its original aa batteries and ac power cord; three new aa batteries and a new v-lock power cord were provided.The mpu was powered on while connected to a test hm3 controller and mock loop.The mpu operated as intended throughout several days of testing, even when the ac power cord was manipulated by hand, and atypical events were unable to be reproduced.A full functional checkout was performed, and the serviced and tested mpu was converted to a rental unit after passing all tests per procedure.The root cause of the reported event was unable to be conclusively determined through this analysis.The heartmate 3 patient handbook describes all alarms (visual and audible) and what action should be performed when they do occur, including the alarms related to the mpu.The heartmate 3 patient handbook cautions the user to call their hospital contacts if they think, for any reason, any portion of their equipment is not functioning as usual, is broken, or they are uncomfortable with the operation of the equipment.Review of the device history record for the mobile power unit, serial number: (b)(6), showed the device was manufactured in accordance with manufacturing and qa specifications.No further information was provided.The manufacturer is closing the file on this event.
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