Make sure the Dual Float Switch is properly mounted with the round floats hanging below the metal bracket. Ensure the bracket is straight, not on an angle. Once the float switch is activated, it starts a timer that will run the pump about 8-10 seconds before it shuts off. If this is a first-time installation and the pump is running nonstop as soon as you plug it in, verify that the primary pump’s power cord is plugged into the front receptacle of the BWC1 float controller and not directly into the outlet itself.