A draeger fse was dispatched to repair the device and the root cause was traced back to a stuck pump filter with dirt.Replacement of the filter could solve the problem.The auxiliary vacuum pressure is needed to actuate the valves that control the ventilation and to keep the ventilator diaphragm in place during piston movement.With a vacuum pressure out of range the control of the ventilation cycles may be disturbed significantly.The device is subject to routine service and maintenance activities whereby the pump performance will be checked and, a re-calibration will be performed if necessary.Complaint data demonstrates that the inlet filter of the pump is often not checked/replaced as recommended ¿ if it becomes clogged the performance of the pump decreases.
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