Dishwasher Not Draining When the (Sink Drain May Be Clear)

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

1. Check 1

   Stop the dishwasher and let a hot cycle cool before looking inside. From a dry position, note whether water is above the filter or only in the low sump area, whether the cycle ended normally or with a drain error, and whether the pump made a drain sound. Do not start another full cycle just to reproduce the symptom.

   Expected result: Water is above the filter, only a small amount remains below it, a drain error is displayed, the pump is silent or only hums, or the tub drains partway and then refills.

   Next step: Keep the appliance off and use the observation to choose the sink-and-hose, filter-and-drain-area, or service branch below. If water is leaking, reaches electrical equipment, or cannot be isolated safely, stop here and arrange qualified help.

   Stop if: Do not reach into standing water, touch energized parts, or keep cycling the dishwasher while the tub is not draining.

   Why this matters

   Why: Water above the filter or a drain error confirms a drain-path problem, while a small model-designed sump residue may not be a fault. Silent or humming behavior makes a pump, wiring, or obstruction more likely; partial drain or refilling makes routing, backflow, or a connection problem more likely.

2. Check 2

   Run the connected sink for about 30 seconds and watch the sink drain, then inspect only the visible dishwasher drain hose under the sink. Look for a kink, crush point, loose-looking connection, low routing that can allow backflow, or an obstructed air gap. If a disposal or dishwasher was newly installed, note whether the dishwasher inlet connection may still have its factory plug.

   Expected result: The sink backs up, the air gap spills or is dirty, the hose is kinked or damaged, water flows back into the tub, or all visible sink-side checks are normal.

   Next step: Clear only accessible air-gap debris as the manual permits and straighten a gentle hose bend without disconnecting it. Refer a blocked household drain, damaged hose, new-installation connection, or suspected disposal plug to a qualified plumber or installer; proceed to the model-approved filter check only when the visible path is safe and intact.

   Stop if: Do not disconnect a water or drain fitting, pull the dishwasher out, or remove a disposal plug yourself when the connection is pressurized, inaccessible, or newly installed.

   Why this matters

   Why: A sink that fails the flow check points to household plumbing rather than the dishwasher. An obstructed air gap, kinked hose, missing high routing, or a closed new-disposal inlet can prevent discharge even when the sink appears usable at other times. Normal visible connections shift suspicion toward the filter, sump, pump, or an internal restriction.

3. Check 3

   With the dishwasher off, remove the lower rack and inspect the filter and drain opening only if the owner's manual identifies them as removable. Lift out loose food or glass with protection, rinse the filter with warm water and a soft brush, and reinstall every piece in the specified orientation until it is fully seated or locked.

   Expected result: Food or a foreign object is present, the filter is coated, a drain cover or filter was mis-seated, the model has no removable filter, or the drain area is already clean and correctly assembled.

   Next step: If debris was removed and all parts are correctly seated, use the model's drain-only or short test procedure once, without dishes or detergent, and watch for complete discharge. If the water remains, the pump only hums, the error returns, or no user-removable path exists, stop and arrange service.

   Stop if: Do not pry a drain cover, probe a pump, handle sharp debris bare-handed, or use a chemical drain product inside the dishwasher.

   Why this matters

   Why: Debris or an incorrectly assembled filter can restrict flow and trigger a drain fault. A self-cleaning or non-removable design should not be forced open. A clean, correctly assembled path makes a blocked pump, internal valve, wiring fault, or hidden hose restriction more likely.

4. Check 4

   After the sink-side path and model-approved filter check are complete, use the dishwasher's documented cancel-and-drain function or other manual-approved drain-only test. Observe the discharge at the sink connection without placing hands near the pump or hose fittings.

   Expected result: A strong discharge clears the tub, discharge is weak or intermittent, the pump hums without moving water, the pump is silent, water returns after draining, or a drain error returns.

   Next step: If it drains completely and remains dry, monitor the next normal load. For weak or absent discharge, recurring errors, or backflow, leave the dishwasher off and provide the recorded sound, error, water level, and sink-connection result to qualified appliance service or plumbing help.

   Stop if: Do not bypass a control, test live wiring, remove the pump, or run repeated cycles to force a drain.

   Why this matters

   Why: A complete drain after cleaning supports a temporary restriction or seating issue. Weak, intermittent, silent, or humming-without-flow behavior points toward a pump, electrical control, internal obstruction, or hidden hose issue. Water returning after a successful drain points toward backflow or routing.