Drop your drain hose into a basin on the floor and see if you get any water out. If nothing comes out you have to remove the backplate and clear the blockage from your sump. If the water comes out you have to remove the hoses from the pump and check it for blockages.
The anti flood device is a piece of foam in the base that rises when there is water in the base and closes a microswitch connected. The only way to reset it is by tipping it and thus draining the base.
Check if your lower arm is loose by removing the lower wash basket and tightening the...
What happens when you get water in base is that id doesn't fill and will only drain. To remedy this you have to tip it backwards to drain the base and reset the anti flood device. The main cause for this is the lower wash arm fixtures works it's way loose and drips into the base.