This is the 2nd dishwasher we have bought for the kennel & neither will empty! There is not a garbage disposal or any fancy plumbing. The drain & hose from the grooming tub goes directly out of doors & there's no problem with this. the washer will reach the drain cycle, wait a few minutes then all the washer lights go on & then all beep & then the machine automatically shuts itself off. I have the dishwasher on a flat surface on a large cart above the grooming tub. Needless to say we are baffled!
Your dishwasher drains into the garbage disposal. It you tried to use a plunger to clear your clogged sink or run the disposal with to much junk in it you may have force debris into the dishwasher drain hose. With both the dishwasher and garbage disposal disconnect from power disconnect the dishwasher drain hose from the garbage disposal. This is usually about a one inch black hose. Clear out any debris in the hose and inlet nipple on the garbage disposal. If debris is compacted far down the hose it will need to be disconnected from the dishwasher end and remove to clear the blockage.
Usually answered in minutes!