Dishwasher isn't draining all the water out after cycle is complete. Checked all lines, no clogs and both pumps are working

SOURCE: GE diswasher GSD4020Z02BB doesn't completely drain

rs, in the back under the screen is a piston nut assy. This is a common problem on these GE's. The seal on the assy. becomes warped or worn and when this happens we get water left in the tub after drain. It's an easy fix. The screen comes off and the pistion nut assy. simply unscrews. The part number is WD24X220. You can look it up on the net, inexpensive. Catriver..post back.

SOURCE: Water Will not Drain

It could be cause the water level switch. The level switch is usually a diaphragm device with a small clear tube attached between the switch and the bottom of the washer's outer tub. I am not familiar with your machine,but if you will open the rear panel you will find it easily. Clear tube from any obstruction. Good luck !

SOURCE: Water not completely draining... hose not clogged.

If there is an air gap (located in the sink, near the faucet), check to see if it is clogged. Unscrew the top cap and see if there is anything blocking inside. Note: If there is no air gap installed, the dishwasher might not drain properly.

If the drain hose is clogged, the dishwasher would not drain. If there is an air gap installed, it is very common that a hose going from the air gap into the garbage disposer is clogged. Remove and clean the hose. Make sure to reattach the hose before starting the dishwasher.

Note: If you recently had a garbage disposer installed, it is common to overlook removing the drain plug.


Some dishwasher models use a belt to drive the pump. Replace the belt if found broken.

Note: Sometimes the belt would just come off the pump. Even though it might not be broken, it is recommended that you replace the belt, because it is probably too stretched out.


Some models have two impellers inside the pump - one, wash impeller, takes care of the wash cycles, the other, drain impeller, drains the water out. If the drain impeller is broken (broken blades, shaft), the dishwasher would not drain. Replace any broken pump components.



Some models (for example most GE dishwashers) use a drain solenoid to drain water out. Sometimes the solenoid gets stuck, preventing the water from draining out. Try to free up the solenoid. If unsuccessful, you might have to replace the pump assembly.


If the motor is stuck, it is sometimes possible to free it up by manually spinning the motor.


Check all the above to address thsi issue.