The manufacturer received information alleging a ventilator's screen was black and remained black when buttons were pressed.The screensaver was set to 'off' and the airflow was being delivered as usual.An hour later the reported screen displayed when the power was turned off and then turned on again.There was no harm or injury reported.The device has not been returned to the manufacturer.At this time, we are unable to confirm the alleged malfunction.A supplemental report will be submitted when the manufacturer's investigation is complete.During the evaluation of the device at the manufacturer's service center, the alleged malfunction was unable to be confirmed during operational checking.It is possible that the issue was caused by a temporal failure to the circuit board.The circuit board was replaced to resolve the issue.Additionally, repair test, alarm check, battery check, run in tests, and cleaning were performed.The unit operated properly.A supplemental final report will be filed.
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