1260 Quat pump VL G1311C - no vacuum problem

Hi 

please help , i have an hplc 1260 infinity  , the Quat pump VL  G1311C  in indicating a not ready condition ( NO VACUUM ) , and when launching the method , a red error is displayed '' ( LIMIT NOT REACHED ) 

can you help to find a solution of the problem? 

and what s the reason of it ?

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