1,2,3,5,6,7 outlets are TRIACS. Which have what is called Leakage current. They are allways on so to speak. They need a larger load connected to them to be acctually OFF. It's quite common actually. Everyting in industrial control is like that. A lot of times, with a LED indicator light or something, we need to put a resistor in with it in parallel to load the output so that it draws the leakage current down.
Swapping your pump to 4 or 8 outlet will solve it. They are true dry contact relay outputs
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Dan Pesonen
Umm, a tank or 5
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