I have two pumps that control my pool. The first pump is for the filter/skimmers/returns and the other pump (Dura Glas Sta Rite) is for the main drain and a waterfall feature. Water gets sucked from the main drain and comes out the waterfall. The main drain pump stopped working at the end of last season. It went from whining when running, to just a click, to nothing.
I hired a company to open the pool last week. I replaced the pump motor (Pentair A100DLL 3/4 HP, 230V) yesterday. Previous to turning on the pump I removed the cover to the pump basket and filled it with water. The pump turns on but I get no suction from the main drain. The water exits the pump but I don't see it come out of the waterfall. The line is plumbed so there is a spigot after the pump outlet and before the waterfall valve. When I opened the water spigot and closed the valve to the waterfall, water shoots out of the spigot. Correct me if I'm wrong, but this means that the pump is working on the "blow" side but not the "suck" side.
Is there something I'm missing that would cause this? Did I miss a step? One key thing I noticed was that the main drain cover somehow came off during the winter and I can see leaves down there. Could it be something as simple as a blocked drain? The water is 52 degrees right now so I won't be going in the water for a while to check if it's blocked. Thanks