Two original packed hose systems from the lot of the affected hose system were provided, on which the reported symptom could not be reproduced.On the basis of the available photo, the reported failure pattern could be confirmed.For the affected ventstar flex 220, a crack was visible in the flex hose, located exactly on the lower edge of a fold in the hose.In the area of the fold, the load is greatest when the flex hose is pulled out, so it can be assumed that a mechanical force exceeding the normal load was the cause of the symptom.Finally the exact cause could not be determined.A relevant leakage is detected and alarmed by the connected basic unit during the pre-use check or during use.
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