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I guess you are talking about the discharge elbow on top of the pump, that is called a discharge elbow, they are usually clamped to the top of the pump casing to prevent it from leaking or blowing off. Make sure the clamps are properly tightened.
Water pressure makes the unit kick on and off. Water could be leaking from the toilet tank into the bowl and from bowl into the pump. Or the check valve inside the discharge elbow (on top of the lid) may not be sitting properly or is being obstructed causing waste water to leak inside the pump, creating enough water pressure to make the unit kick on and off by itself.
Water pressure makes the unit turn on and off. If it turning on by itself then could be water draining back into the pump. Water could be leaking from the check valve on the discharge elbow into the pump or from the toilet tank into the bowl. Inspect the flapper on the check valve and the flapper on the flush valve.
Water pressure makes the unit turn on and off. It will only activate on it's own when enough water pressure is present. Most likely it can be water leaking from the toilet tank into the bowl, and from the bowl into the pump. Or could also be that waste water is slowly draining back into the pump through the check valve on the discharge elbow, creating enough water pressure that it will make the unit kick on and off.
Water pressure makes the unit kick on and off. It will turn on by itself if water is somehow draining back into the pump. It could be water leaking from the toilet tank into the bowl and from the bowl to the pump or the flapper on the check valve inside the discharge elbow may be stuck open or could be defective and allowing waste water to drain back into the pump, once it builds up enough water pressure inside the pump, the unit will kick on and off by itself.
I had the same issue before and called Saniflo. They told me that when the pumps are assembled at factory, they use soapy water to test the unit and see if it leaks. By flushing the toilet with plain water only a few times will eventually get rid of the soap residues inside the pump.
self activating - the pipe work is blocked and the saniflo is trying to emty (microswitch activated). as the outlet is blocked so effluent will be forced back - in this case up into the pan. Messy job- drain down remove clean clear blockages refit.
I believe you are talking about the 90 degree rubber elbow on top of the pump where the waste discharges. There is a rubber hose sticking out the top of the pump casing about 1/4" you need to inset the check valve and press down as far as it goes, next step you have to push the rubber elbow on top and also press as far as it goes, then the last thing you put on is the clamp which will tighten the rubber elbow against the check valve and the rubber hose sticking out the top of the pump. This will stop the leak and will prevent the elbow from blowing out of the unit. But it must be done in the same sequence as i explained.