Dishwasher not draining: What to Check and What to Do Next

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   With the dishwasher idle and the floor around it dry, look through the open door without reaching into water and note where the water sits: only in the filter or sump recess, across the tub floor, near the door opening, or outside the appliance.

   Expected result: A small amount confined to a filter or sump area can be model-normal, while water across the tub floor or near the door indicates incomplete draining or a severe restriction. Water outside the appliance adds a leak concern.

   Next step: Record the visible level and take a photo without touching the water. If water is near the door, outside the unit, or spreading across the floor, stop using the dishwasher and arrange service.

   Stop if: Stop immediately if water is leaking toward an outlet, cord, junction, or other electrical equipment, or if the floor is becoming wet.

   Why this matters

   Why: The water location sets urgency and helps distinguish a localized filter-area observation from a blocked path, pump problem, backflow, or leak.

2. Check 2

   Read the display and note when the water remains: after a completed cycle, after a cancelled cycle, after a power interruption, or after the dishwasher stops before the drain portion. Do not start repeated drain or wash cycles to make the comparison.

   Expected result: A code, a cycle that stops before draining, a steady pump hum with no water movement, or no pump sound at the expected drain stage points to different diagnostic paths. Water that returns after the sink or disposal is used suggests a downstream restriction or backflow path.

   Next step: Write down the code exactly, the cycle selected, and what the dishwasher sounded like. Use the model manual or give those details to service; do not repeatedly test a full tub.

   Stop if: Stop using the appliance for burning smell, damaged wiring, a repeated breaker trip, unusual grinding, or water rising toward the door.

   Why this matters

   Why: Timing and control behavior can separate a flow restriction from a pump, door-switch, wiring, or control issue, but a code must be matched to the exact model manual.

3. Check 3

   If the filter area is dry enough to view safely and the appliance is not running, look at the visible filter screen and sump opening without reaching into standing water or removing parts. Note food residue, paper, labels, or other visible material; do not use a sharp or forced tool.

   Expected result: A visibly covered filter or sump opening can restrict flow. A clean-looking visible area does not rule out a deeper pump or hose obstruction, and glass or sharp debris is a stop condition rather than a hands-on task.

   Next step: Follow the model manual only when safe isolation and a dry work area are confirmed; otherwise leave the filter and sump closed and schedule service. Record what is visible for the technician.

   Stop if: Do not reach into the sump, handle glass or sharp debris, remove a filter against resistance, or continue if water or power conditions are uncertain.

   Why this matters

   Why: The observation can support a filter-related branch but cannot confirm pump condition or justify reaching into the sump while water or power is present.

4. Check 4

   From a dry, accessible position under the sink, look at the exposed dishwasher drain hose, air gap if present, and sink or disposal connection without loosening clamps, detaching the hose, reaching into the disposal, or touching wet plumbing.

   Expected result: A visibly kinked, crushed, sagging, or disconnected hose, a blocked-looking air-gap outlet, or water backing up at the sink connection can explain poor draining or return flow. A normal-looking route does not prove that the hose or pump is clear.

   Next step: Photograph the hose route and connection, note whether the sink or disposal also drains slowly, and give the information to service. Do not detach the hose or operate the disposal with a hand inside it.

   Stop if: Stop if the area is wet, a hose is under tension, the connection is leaking, or the disposal or sink has a blockage that requires hands-on work.

   Why this matters

   Why: Sink-side observations separate an external routing or downstream connection concern from an internal dishwasher diagnosis. A recently installed or replaced disposal can also leave an installation-specific drain issue.

5. Check 5

   Note any recent change before the first failure: dishwasher installation, disposal replacement, under-sink work, a new detergent, a moved hose, or a power event. Compare only with your existing observations; do not alter the installation or run another cycle to test it.

   Expected result: A new installation or disposal change makes hose routing, an air gap, or an unremoved disposal inlet plug more relevant. A failure after normal operation makes a clog, pump, control, or component fault more plausible, but does not identify which part failed.

   Next step: Provide the installation or maintenance history, model number, exact error text, water location, and sink-side observations when arranging service.

   Stop if: Do not continue troubleshooting if water is leaking, the appliance is electrically unsafe, or the drain path requires panel removal or hose disconnection.

   Why this matters

   Why: History tells the technician which branch to inspect first and prevents ordering a pump or hose before the cause is confirmed.