Potential patient underdose.Customer reported during prime, the replacement liquid flowed back to the bag and the machine alarmed "return pressure low".After check of the device and set, the tube on the replacement pump was assembled the wrong way.The tubing appeared to be assembled upside down or opposite of the specification.The customer provided a picture and video for evaluation.In the video it is visible that the com-tec generated an alarm "return pressure low".However, there is no visible deviation.Per investigation, there was no harm to the patient.This was a user inconvenience as there was a loss of set and solutions.The investigation did not identify a clear assignable cause since no deviation was visible from the picture and video received from the customer.Alarm "return pressure low" could be caused by an obstruction in the return line by kinks or by a closed clamp.
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