Dishwasher Not Draining: 8 Causes and How to Fix Each

A dishwasher can stop before its drain phase finishes. First check whether the controls show a paused cycle, flashing lights or an unfinished program. Frigidaire says flashing lights during a drainage issue are normal on some models. That makes the display worth checking, but it does not prove the controls are defective.

If the controls and manual match, Frigidaire’s owner guide says to hold Cancel for 5 to 10 seconds to clear the current cycle, then start a new cycle so the unit can drain. Use the button and timing only if they match your dishwasher. Other brands use different controls. Do not keep pressing buttons if the display or manual does not match.

If the new cycle ends and water remains, move to the filter and drain-path checks below. If the dishwasher will not start, shows a code you cannot identify, or stops again with a breaker problem, call service rather than repeating the reset.

This is a good first physical check when water is limited to the filter area and the pump makes its usual sound. Frigidaire describes a coarse filter and a cylinder fine filter. Its filter guide says the cylinder catches larger items such as glass, bones and seeds. Food soil around the filter can also restrict the route into the sump.

With power off, remove the lower rack if your manual allows it. Frigidaire says to turn the cylinder filter counterclockwise, lift it out, empty it and rinse it under the tap; a sponge or bottle brush may help. Lift and rinse the coarse filter too. Whirlpool’s guide describes a different model-specific locking sequence, so use your own manual for removal and refitting rather than forcing a part that does not turn easily.

Use a flashlight to look into the open filter area for visible scraps. Samsung warns that debris there can be sharp. Remove only loose debris you can reach safely; do not disassemble the sump or put a hand into a hidden opening. Put every filter back in its correct position before restoring power. If you are uncertain how it locks, stop and check the manual.

After reassembly, run a normal rinse or short cycle and observe the drain. If the same water remains, do not keep cleaning the same screen. The hose, sink connection or pump may be the next issue.

This jumps near the top of the list when draining stopped after a new dishwasher or disposal was installed. The dishwasher hose may be connected to a disposal inlet that is still closed by its knockout plug. Frigidaire and Samsung both list the plug as an installation check; Whirlpool also points owners to the disposal connection.

Look only at the visible hose connection under the sink. If the connection is new and you cannot confirm that the plug was removed, ask the installer or a qualified technician to check it. Do not put a hand inside the disposal and do not try to reach into the inlet. The pliers and screwdriver in the cause card are planning estimates, not an instruction to disassemble a disposal.

If the plug is confirmed removed, look at the hose for a sharp bend or pinch before moving to the other checks. If you cannot see the connection safely, stop. A quick call to the installer is a better next step than pulling the dishwasher out or disturbing wiring and plumbing.

A hose can be trapped behind the dishwasher or shifted during work under the sink. Samsung calls out a new dishwasher resting on its own hose as a common post-install problem. Whirlpool and Frigidaire also say to look for a kink, pinch or incorrect route. Slow draining or water that returns after a cycle fits this cause better than a one-time interrupted cycle.

With the dishwasher off, use a flashlight to inspect the hose where it can be seen under the sink. Look for a flattened section, a tight bend, or a hose that has slipped down. Whirlpool says the line needs a high loop secured under the counter or an air gap. Frigidaire’s drain troubleshooting page also says to check for a kink and an incorrectly installed hose; it does not make one brand’s installation measurement universal.

If you can straighten a visible loose bend without moving the appliance, restore a smooth route and run one cycle to see whether the symptom changes. Do not pull the dishwasher forward, cut the hose, or disconnect plumbing unless you know the installation steps for your model. If the hose is cracked, crushed or too short to route safely, ask a technician to replace it.

The hose cost range shown here comes from Fixr, a cost guide, and includes labor in the cited estimate. It is not a Frigidaire, Samsung or Whirlpool parts price.

Not every kitchen has an air gap. If yours does, it is the small capped fitting on the counter next to the faucet. Frigidaire’s filter guide says to lift the cover and inspect it. Whirlpool says a working air gap or a properly raised hose prevents drain water from returning to the tub.

With power off, lift the removable cap and check for visible buildup. Use the small brush in the cause card to clear only the exposed opening. Do not push a tool down into a hidden hose or force a fitting apart. Put the cap back and run a drain cycle while watching the fitting.

If water spills out of the air gap during the drain phase, Whirlpool says the blockage is downstream of it: the hose run toward the drain or the sink plumbing. That observation changes the next call. It does not mean the air gap itself needs replacing.

Check this when the sink is slow as well as the dishwasher, or when water spills from the air gap as the dishwasher drains. Samsung says a sink that does not drain normally points to the plumbing and recommends calling a plumber. Whirlpool makes the same distinction when water backs up at the air gap.

Run the sink and watch whether it clears. If it backs up, stop troubleshooting the dishwasher and call a plumber for the sink drain. Do not pour chemical cleaner into the dishwasher or use it as a shortcut through a shared drain. If the sink drains normally but the air gap overflows only during the dishwasher cycle, tell the plumber or appliance technician exactly when it happens.

This check helps separate a house-drain problem from an appliance problem. Do not open the sink trap or disconnect a drain line; ask a plumber to inspect a suspected household blockage.

Put the pump lower on the list than a stopped cycle, a dirty filter or a recent installation problem. Whirlpool says a steady hum with no water movement can point to a jammed impeller or obstruction. Grinding can mean a hard object such as glass is involved. Water near the door opening is another reason to stop the simple checks and get service.

These sounds are clues, not proof that the pump must be replaced. Do not open the pump housing, try to turn the impeller, or run a meter test. A technician can inspect the pump and the rest of the drain path without turning a guess into a parts order.

The Fixr range shown in this cause card combines its pump repair and replacement estimates. Fixr is a cost guide, not the appliance manufacturer, and its range is not a quote for your model. Ask for an itemized diagnosis so you can compare the repair with a replacement quote. If you want a second symptom-specific route, see dishwasher pods not dissolving for the separate detergent problem; it does not share this pump diagnosis.

A silent pump during the drain phase, a breaker that trips again, an unfamiliar code, or a burning smell is not a reason to open the appliance. Whirlpool says a paused cycle without the pump starting can involve an electrical or control fault. Several different failures can look similar from outside.

Stop using the dishwasher if the breaker trips repeatedly, wiring looks damaged, or you smell burning. Do not reset the breaker over and over. Leave panels closed and call a qualified appliance technician. If a code is displayed, photograph or write down the exact characters so the technician can check the model’s manual.