The investigation was performed based on the provided information as no log file was available.Reportedly the error log contained the following entries: patient airway pressure very (b)(6) (less than -10mbar), motor slow, motor stalled.The problem of a too slow and stalled motor could be confirmed during testing on-site so that finally it could be determined by the service technician that the ventilator motor was root cause for the reported ventilator failure.A negative patient airway pressure can be an indication for a low pressure within the ventilator being a result of a too low fresh gas flow in combination with a sticking auxiliary air valve.This could subsequently also lead to a slow/stalled motor.But as this symptom normally is accompanied by other error log entries which were not reported this can be excluded.Therefore it can be assumed that the (b)(6) patient airway pressure was most likely related to the surgical case.As in case of a slow or stalled motor the fabius cannot deliver the required tidal volume automatic ventilation is stopped accompanied by a corresponding alarm.Manual ventilation is still possible.Replacement of the ventilator assembly with motor and light barrier cable has solved the reported symptom.The unit was tested afterwards and was handed over to the user ready for use.
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