A dishwasher with standing water at the bottom is a common complaint. Here are the parts to check, from easiest to hardest.
1. Drain Filter and Sump
Pull out the bottom rack and check the drain filter at the bottom of the tub. Food debris, glass, and grease accumulate here. Remove the filter and clean it thoroughly. This fixes the problem 40% of the time with no parts needed.
2. Drain Hose
Check the drain hose where it connects to the garbage disposal or sink drain. It may be kinked, clogged, or the knockout plug in a new disposal was never removed. Straighten or replace the hose.
3. Drain Pump
If the filter is clean and the hose is clear, the drain pump motor has likely failed. You may hear a humming sound during the drain cycle. Drain pumps cost $20-60 depending on the brand and model.
4. Check Valve
The check valve prevents water from flowing back into the dishwasher after draining. If it is stuck closed, water cannot drain. If stuck open, water may flow back in. Cost: $5-15.
5. Drain Solenoid
Some older models use a solenoid to open the drain valve. If the solenoid fails, the drain valve stays closed. Test with a multimeter. Cost: $15-30.
6. Control Board
If nothing else works, the control board may not be sending the drain signal. This is the most expensive fix at $80-200 and should be a last resort diagnosis.
Finding the Right Part
Search your dishwasher model number on PartHawk to see every available drain pump, check valve, and control board across 20+ suppliers. Compare prices and order from the cheapest source.