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Mar 2 15 5:17 AM

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I've got 3 LS-20 and 2 LS-16 sullairs. One LS-20 and one LS-16 showing air filter maintenance alarm. Air filters are new in both machines, main intake is good, vacuum switches are both brand new and alarm still coming in. I've checked everything I can think of and consulted with sullair, and still no solution.  

Has anyone else had this issue before? 

Suggestions?