SPT SD-9239W portable dishwasher makes a buzzing sound during pre-fill drain and draining on all parts of cycles. Washes fine, rinse is good, drain is noisy. Dishwasher is about 4 years old.

SOURCE: Dishwasher isn't draining

It could be the pump, but not only. Check first that you don't have any clog in the drain line. If drain line is clean, open machine's rear panel and : - Look if the pump works. If it doesn't work check that pump get power (with multi-meter). In case it get power (and does't work), it should be replaced. - In case the pump works - The machine has a drain valve with an electric solenoid (the drain pipe connected to it). When it get power the valve opens and diverts the water to the drain line. Test that it get power. In case it get power and dosen't work - You can easyly open the valve and clean it (from scale or other dirt). Be aware you should disconnect the power cable from machine before doing it !!!!! Check as well for valve's coil resistance. In case you have no resistance measurement - you should replace for a new valve. Good luck !

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: Diswasher motor making noise during wash cycle

It could be the impeller on the motor. The impeller fits over the shaft of the motor and might have split/broken up. That funny noise is probably the shaft spinning inside the damage impeller. Fortunately the impeler is fairly inexpensive and easy to replace. I believe there are one or two parts/covers to remove that are held in by a roughly half dozen torx screws.

SOURCE: Noisy Bosch dishwasher SHU43C05UC

your main wash motor is faulty it must be replaced.

SOURCE: GE Nautilus won't drain after Rinse Cycle

Check disposer plug. If a garbage disposer has been recently installed, it is possible the disposer drain plug was not removed. The drain plug is a plastic piece in the disposer that blocks the hole where the dishwasher hose connects. Also check the hose connected to the disposal. Mine apparently had a kink in it. When I straightened the hose the dishwasher drained at full speed (I recently had a plumber re-route a hot waterline. He must has bent the hose). Hope this helps. If not go to the GE website. That's where I found my answer.