Start with the simple things. Make sure the drain hose isn’t kinked. Been seeing a lot of this lately.

This is a belt drive washer. In addition to driving the transmission, the belt also drives the pump, shown here. Pull the belt off the pump and turn the pump pulley by hand. If it’s hard to turn or seized up, the pump is fried. You can buy a new pump here.

As long as you’re down there, better check on that belt, too. Also, a genuine manufacturer’s repair manual for this washer can help keep you from banging your head against the wall.