Hello Plumbing! My macerator - a Turboflush P - isn't kicking in unless I give it a whack on the side. If I remove the pressure switch tube and blow into it, it won't engage unless I give it a whack. If I remove the pressure switch tube and don't blow into it and give it a whack, it doesn't do anything. (I'm assuming this would suggest that the pressure switch is functioning correctly.) If I turn it off and then on, it performs a brief spin. Any ideas?.... Thanks in advance, everyone.