Dishwasher Not Draining?
Start with these safe checks.
If your dishwasher is not draining, stop or cancel the cycle and allow any hot water to cool first. Check the removable filter and accessible drain area for trapped food, paper labels, or glass shards. If water remains after clearing these accessible points, use guided diagnosis to isolate the issue rather than dismantling the pump or forcing internal components.
Which situation matches yours?
Identifying the exact symptom helps you take the right troubleshooting path.
Water remains immediately after a wash cycle
Standing water is left in the tub at cycle completion. Follow the 7 safe checks on this page.
Water drains during cycle, but returns when off
Water gradually fills the bottom while the dishwasher is not running. This points to plumbing or water-entry issues rather than a cycle drain blockage.
Diagnose backflow issue →Dishwasher displays an error code
A fault code or blinking light pattern indicates a specific drain error reported by the control board.
Look up error code →Loud grinding or humming noise while trying to drain
The pump motor engages with unusual buzzing, grinding, or clicking sounds while water fails to move.
Diagnose noise & draining →Before you start
Keep troubleshooting safe and non-destructive by observing these precautions:
- Cancel the cycle and let hot water and the heating element cool before touching interior parts.
- Disconnect power at the breaker before inspecting tight spaces or wiring connections.
- Watch out for broken glass, toothpicks, or sharp debris that frequently settle in the drain well.
- Never reach blindly into dark pump cavities or impeller openings.
- Do not pour chemical drain cleaner into a dishwasher — caustic chemicals damage internal seals and release toxic fumes.
- Do not dismantle the pump motor, impellers, or electrical assemblies during routine home checks.
7 Safe Checks to Try First
Follow this sequential, homeowner-safe troubleshooting order before assuming a component failure.
Let the cycle finish or try the cancel/drain command
WHAT: Verify whether the cycle has truly ended, or trigger an active drain cycle using the appliance controls.
WHY: Some cycles pause with water in the tub between phases. Interrupting a cycle prematurely leaves water behind.
WHAT NEXT: If your dishwasher has a Cancel or Reset button, press and hold it (typically 3 seconds) to force a drain sequence. Listen for pump hum. If water still remains, proceed to Check 2.
Remove accessible standing water if needed
WHAT: Bail out deep standing water with a cup and sponge so the bottom of the tub and filter area are visible.
WHY: Deep water conceals broken glass, debris, and the filter lock mechanism, preventing safe inspection.
WHAT NEXT: Scoop water into a bucket, then soak up remaining puddles with a towel. Do not siphon hidden hoses.
Check and clean the removable filter
WHAT: Unlock and remove the cylindrical filter assembly at the bottom of the tub, then rinse it under warm water.
WHY: A filter coated with grease, food solids, or paper restricts normal gravity drainage into the sump.
WHAT NEXT: Turn the filter counterclockwise to release it. Clean the mesh with a soft brush and dish soap. If stuck, do not force it.
Inspect the accessible drain sump area
WHAT: Look directly into the sump cavity underneath the removed filter for foreign objects.
WHY: Glass shards, fruit seeds, twist ties, jar labels, and bone fragments frequently bypass the filter mesh.
WHAT NEXT: Wearing gloves, carefully remove visible debris. Do not probe into internal impellers with metal tools.
Look for an obvious drain-hose kink
WHAT: Inspect the accessible corrugated drain hose where it routes under the sink to the disposal or house plumbing.
WHY: Cleaning supplies or trash bins pushed under the sink can pinch the flexible hose, restricting water flow.
WHAT NEXT: Ensure the hose has a gentle, unkinked arch. If pinched, gently reposition it. Do not pull or disassemble built-in cabinets.
Consider recent plumbing or disposal changes
WHAT: Check if a new garbage disposal or sink drain was installed shortly before the drainage problem started.
WHY: Brand new garbage disposals contain a plastic knockout plug inside the dishwasher connector port that blocks drainage if left in.
WHAT NEXT: If a disposal was recently installed, verify the knockout plug was removed. If unsure, use guided diagnosis for installation guidance.
Reassemble securely and test with a quick cycle
WHAT: Securely lock the filter back into place and run a short rinse or quick test cycle.
WHY: A clean test run confirms whether water now drains completely or if a deeper restriction remains.
WHAT NEXT: Check the tub bottom after the cycle ends. If water remains, the problem requires guided diagnosis.
Still not draining after these 7 checks?
If accessible checks are clear and standing water persists, the issue may be deeper in the drain system (such as a restricted check valve, pump impeller, or electrical sensor). Use our deterministic diagnosis to isolate the cause.
What usually causes a dishwasher not to drain?
Drainage problems typically fall into two categories: accessible blockages that homeowners can safely clear, and mechanical or electrical restrictions that require structured diagnosis.
Accessible causes you can check safely
- Dirty filter: Grease, starch, and food sediment coating the fine mesh barrier.
- Sump debris: Foreign objects (glass, seeds, labels) restricting the drain opening.
- Kinked drain line: Flexible hose under the sink compressed by household items.
- Disposal knockout: A newly installed garbage disposal with the drain plug still intact.
Deeper causes that require guided diagnosis
- Restricted check valve: A flapper valve preventing backflow that has become stuck or swollen.
- Drain pump restriction or failure: Foreign objects binding the impeller, or motor winding failure.
- Sensor or control board fault: Pressure switch, float switch, or board relay not energizing the pump.
Important: Never assume the drain pump is broken without systematic verification. The vast majority of drainage problems are caused by simple blockages in the filter, sump, or sink connection.
Does the water come back later?
Water that drains normally and then reappears while the dishwasher is not running is different from failing to drain at the end of a cycle. Possible causes include plumbing/backflow conditions, drain-hose configuration issues (such as a missing high loop), or water-entry issues. Follow our guided diagnosis to investigate this specific symptom.
Seeing an error code?
Many dishwasher brands report drain restrictions through specific diagnostic codes (such as Bosch E24/E25, Whirlpool F8E1, Samsung 5C/5E, or LG OE). Look up your code for verified manufacturer guidance and the safest first check.
Look Up Error CodeNeed brand-specific guidance?
Drain configurations, filter locks, and access covers vary between manufacturers like Whirlpool, Bosch, GE, KitchenAid, Frigidaire, and Samsung. Select your brand to start tailored diagnosis.
Select Your BrandNot Draining by Brand
Drainage systems and homeowner-safe checks can differ by manufacturer and model. Use the verified brand guide where available:
Whirlpool Dishwasher Not Draining
Verified checks and model guidance for Whirlpool dishwasher drainage issues.
GE Dishwasher Not Draining
Verified checks and model guidance for GE dishwasher drainage issues.
Bosch Dishwasher Not Draining
Verified checks and model guidance for Bosch dishwasher drainage issues.
Why trust DishwasherFixes guidance?
Safe Homeowner Steps First
We prioritize non-destructive, safe checks that any homeowner can perform without specialized tools or electrical risks.
Deterministic Diagnosis
Our guided tools use structured decision trees rather than generic guesses, helping you isolate root causes logically.
Clear Technical Boundaries
We clearly define when a check is safe for DIY and when a problem requires professional service or electrical testing.
Frequently Asked Questions
Direct answers to common questions about dishwasher drainage issues.
How do I force my dishwasher to drain?
To force an immediate drain cycle on most modern dishwashers, press and hold the "Cancel" or "Start/Reset" button for 3 to 5 seconds. You will hear the drain pump engage for 60 to 90 seconds before shutting off. On older mechanical-dial dishwashers, turn the dial clockwise to the "Drain" segment. Ensure the door is firmly latched before starting.
Why is there standing water in the bottom after a cycle?
Standing water after a cycle is most commonly caused by a clogged filter mesh, food debris in the sump basin, a kinked drain hose under the sink, or a garbage disposal knockout plug. If these accessible areas are clear, the issue may involve a jammed pump impeller or a stuck check valve.
Can a dirty dishwasher filter stop it from draining?
Yes. The filter assembly protects the pump and plumbing by trapping food particles. When grease, labels, or food residue coat the mesh, water cannot flow freely into the drain channel, leaving standing water in the bottom of the tub.
Why won't my dishwasher drain after I cleaned the filter?
If the filter is clean but water remains, debris may have slipped past the filter into the sump cavity, or the drain hose under the sink may be pinched. Alternatively, the drain pump impeller may be obstructed by a small glass shard or the check valve may be stuck closed.
Is a little water in the bottom of a dishwasher normal?
Yes, a small amount of clean water (about 1 to 2 cups) resting in the circular sump well directly below the filter is completely normal. This water keeps the internal pump seals lubricated and prevents sewer smells from rising into the appliance. However, standing water covering the base of the tub is abnormal.
Can I use chemical drain cleaner in a dishwasher?
No. Never use commercial chemical drain cleaners (such as Drano or lye-based products) in a dishwasher. These caustic chemicals corrode internal rubber seals, degrade plastic pump impellers, damage heating elements, and produce toxic fumes when heated.
When should I stop troubleshooting and call for service?
Stop DIY troubleshooting and contact a professional if you have cleared the filter and sump, but the pump hums without draining, emits burning electrical smells, leaks water onto the floor underneath the machine, or trips your circuit breaker. These symptoms indicate electrical or motor failures that require qualified service.
Need help identifying the exact cause?
Answer a few quick questions to receive personalized, step-by-step diagnostic guidance for your dishwasher.