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Saniflow keeps going?

My Saniflow vacates the contents of the pan, stops there is then a sound of water coming back into the machine & it starts again, this carries on untill I turn it off at the electic socket
Peter, January 2010
the non return valve is faulty allowing water to return to the machine and activating it, Strip and re seat it or replace

Mike, May 2012
there's a check valve in the discharge elbow. Yours is stuck open.

Bill McKay, March 2010