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case idle:
  if (voltageA0 > 1.0 || voltageA1 < 2.0 || voltageA2 > 3.5) {
     digitalWrite(7, HIGH);
     delay(5000);
     digitalWrite(7, LOW);
     delay(0);     

     if (voltageA0 > 1.0) {
        theState = case1;
        }

    if (voltageA1 < 2.0) {
       theState = case2;
       }

    if (voltageA2 > 3.5) {
       theState = case3;
       }
   }
    

EDIT: To clarify original answer, I inlined the "warning" code and deleted the "case warning", as obviously this state is not longer needed.