Why Is My Dishwasher Not Draining? Fix It Fast
Why is my dishwasher not draining? Top causes ranked easiest to hardest
1. Clogged or dirty filter
The filter traps food particles during every cycle, and a heavily clogged filter is the single most common reason a dishwasher won’t drain. Cleaning it takes only a few minutes and costs nothing.
- Remove the lower dish rack to expose the filter assembly on the tub floor.
- Turn the cylindrical filter counterclockwise and lift it straight out, then remove the flat mesh filter beneath it.
- Rinse both pieces under warm running water, scrubbing gently with a soft brush and a drop of dish soap.
- Inspect the filter housing for any debris left behind and wipe it clean with a damp cloth.
- Reinstall the flat filter first, then lock the cylindrical filter by turning it clockwise until it clicks.
- Run a short rinse cycle and confirm the water drains completely.
2. Kinked or clogged drain hose
A drain hose that is kinked, pinched behind the appliance, or blocked by grease buildup will prevent water from leaving the tub. This is an easy external check before you open anything up.
- Pull the dishwasher slightly away from the cabinet so you can see the drain hose at the back.
- Trace the hose from the dishwasher to where it connects to the sink drain or garbage disposal and straighten any kinks by hand.
- Disconnect the hose at the sink/disposal end (have a towel ready for spills) and blow gently through it to feel for blockages.
- If blocked, push a flexible bottle brush through the hose to dislodge grease or debris, then flush with warm water.
- Confirm the hose has a high-loop or air gap at the cabinet wall to prevent back-siphoning, then reconnect and test.
3. Blocked garbage disposal or drain connection
If a garbage disposal was recently installed or replaced, the knock-out plug inside the dishwasher inlet port may not have been removed, completely blocking drainage. Even on older disposals, a packed disposal can back water into the dishwasher.
- Disconnect power to the disposal at the wall switch or circuit breaker.
- Locate the dishwasher inlet port on the side of the disposal and remove the drain hose from it.
- Shine a flashlight into the port — if a plastic plug is still in place, knock it out with a screwdriver and needle-nose pliers, then retrieve the plug from inside the disposal.
- Run the disposal for 30 seconds to clear any food buildup, then reconnect the drain hose securely.
- Restore power and run a rinse cycle to verify drainage.
4. Faulty drain pump
The drain pump physically forces water out of the tub through the drain hose. If the impeller is jammed by glass or a foreign object — or the pump motor has failed — the dishwasher will hold standing water at the end of the cycle.
- Disconnect power to the dishwasher at the circuit breaker before proceeding.
- Remove all standing water from the tub using a sponge or wet/dry vacuum.
- Remove the lower spray arm and filter assembly to access the pump cover at the base of the tub.
- Unclip or unscrew the pump cover and check the impeller area for broken glass, a fruit pit, or other debris jamming the impeller; remove any obstruction with needle-nose pliers.
- Reassemble, restore power, and run a test cycle. If the pump still does not drain, the pump motor has likely failed and the unit needs replacement.
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5. Defective drain solenoid or drain valve
Some dishwasher models use an electrically operated drain solenoid or valve to open the drain path at the end of a cycle. If the solenoid coil burns out, the valve stays closed and water cannot escape.
- Disconnect power to the dishwasher at the circuit breaker.
- Remove the lower access panel (usually held by two screws) to expose the drain valve assembly near the base of the unit.
- Locate the solenoid coil on the valve body and disconnect its two wire terminals.
- Set a multimeter to the resistance (Ω) setting and probe the two terminals on the solenoid; a healthy coil reads roughly 40–100 Ω — an open-circuit (OL) reading indicates a burned-out coil.
- If defective, replace the solenoid or the complete drain valve assembly, reconnect wiring, and test.
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6. Failed control board or timer
When all mechanical parts check out, the issue may lie with the control board or timer that signals the drain pump to activate. Burnt relay contacts or a failed timer can prevent the drain cycle from ever starting.
- Disconnect power at the circuit breaker and locate the control board (usually behind the door panel) or the mechanical timer (in the control console).
- Visually inspect the control board for burnt spots, cracked solder joints, or a visibly damaged relay.
- If you have a wiring diagram (found inside the door panel or in the owner’s manual), use a multimeter to verify that the board is sending 120 V to the drain pump terminals during the drain portion of the cycle.
- If the board is sending no signal or the relay is damaged, the control board or timer needs replacement — this is often the point to consult a professional.
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For additional guidance, see the U.S. Department of Energy / ENERGY STAR dishwasher resource page for general appliance care and efficiency information.
Frequently asked questions
Is it safe to use the dishwasher if it has standing water?
No. Running additional cycles with standing water already in the tub will not help and can cause the water to overflow onto your floor. Address the drainage problem first — clear the filter and check the drain hose before running another cycle.
How often should I clean the dishwasher filter?
Most manufacturers recommend cleaning the filter at least once a month for households that run the dishwasher daily. If you frequently wash heavily soiled dishes or pots, inspect it every two weeks. A clean filter also improves wash performance and reduces odors.
Could using too much detergent cause my dishwasher to not drain?
Excess detergent can create a thick foam that partially blocks the drain path and confuses water-level sensors, leading to poor drainage. Always use the amount specified on the detergent packaging for your water hardness level, and never substitute regular dish soap for dishwasher detergent.
Why does my dishwasher drain fine some cycles but not others?
Intermittent draining usually points to a partially clogged filter or a worn drain pump that works when cool but fails once it heats up. Start with a thorough filter cleaning; if the problem continues, have the drain pump tested by a technician before it fails completely.