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The log file of the affected device was made available and analyzed.Based on the log file analysis, the reported event could be confirmed: the log file shows that the device performed a restart of the ventilation unit at 6:51 pm on (b)(6) 2025.Alarm messages such as ¿device failure 3¿, ¿device failure 9¿ and ¿device failure 11¿ were logged in addition.At 6:52 pm, the device was switched to standby mode by the user.A faulty pba m16.2 and a faulty the cf-card were identified as root cause of the device restart.The faulty parts must be replaced to remedy the issue.As a safety feature of the system, the safety software analyses and verifies proper function of the device.If the safety software detects an internal failure concerning the ventilator, a local restart of the ventilation unit is triggered.If the ventilation stops, the emergency-breathing valve opens to ambient allowing for spontaneous breathing.Audible alarms are posted to inform the user about the problem.If the ventilation unit cannot be successfully reset within the first 8 seconds, a further reset is triggered.After three ineffective restarts, the system automatically switches off with accompanying alarms.The emergency-breathing valve remains open allowing for spontaneous breathing.However, manual ventilation with an alternate device may be considered necessary.In the current event, the device reacted as specified to a detected internal failure; it performed a restart and posted accompanying alarm messages to inform the user about a problem.The number of similar cases, related to the same root cause, is within the expected range of the respective risk assessment and thus accepted.
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