The patient's son called this morning to report the patient suddenly had a controller fault alarms following the self test.The patient felt well, however was anxious about the alarm.The display screen on the controller indicated to change controller.He did as directed, to call before changing the controller, if it was a caution alarm.The patient came in and controller was replaced without incident.New controller # (b)(4).Waveforms were sent to the manufacturer.Controller will be sent back to the manufacturer for evaluation.Patient safety report filed.
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