Quick answer
First, ensure the dishwasher is level and the drain hose isn't kinked. Then, check the drain filter and drain hose for clogs. If these are clear, inspect the drain pump for obstructions or failure. Always turn off power and water before starting any repairs.
Confirm the symptom
- Water remains in the dishwasher after the cycle ends.
- Dishwasher makes unusual noises during the drain cycle.
- Dishes are not clean due to standing water.
- Error codes related to draining appear on the control panel.
Tools and prep
- Screwdriver (Phillips and flathead)
- Pliers
- Bucket
- Towels
- Flashlight
- Glasses or safety goggles
- Turn off power to the dishwasher at the circuit breaker.
- Turn off water supply to the dishwasher.
Step-by-step troubleshooting
- Check the Drain FilterDo: Locate the drain filter at the back of the dishwasher's bottom interior. Remove it by turning it counterclockwise.Observe: Look for food particles, debris, or other obstructions.Means: If the filter is clogged, clean it thoroughly with warm, soapy water.Next: Reinstall the filter and run a test cycle.
- Inspect the Drain HoseDo: Pull the dishwasher out from under the counter. Disconnect the drain hose from the garbage disposal or air gap.Observe: Check for kinks, clogs, or damage in the hose.Means: Straighten any kinks and clear any clogs. Replace the hose if damaged.Next: Reconnect the hose and run a test cycle.
- Check the Air GapDo: Locate the air gap on the countertop or sink. Remove the cap and clean out any debris.Observe: Ensure water can flow freely through the air gap.Means: If the air gap is clogged, clean it thoroughly.Next: Reassemble the air gap and run a test cycle.
- Inspect the Drain PumpDo: Access the drain pump, usually located at the bottom of the dishwasher. Remove any obstructions.Observe: Listen for unusual noises when the pump is running.Means: If the pump is faulty, it may need to be replaced.Next: Test the dishwasher to see if it drains properly.
- Check the Drain ValveDo: Locate the drain valve, typically near the drain pump. Ensure it opens and closes properly.Observe: Look for any signs of wear or damage.Means: If the valve is faulty, it may need to be replaced.Next: Test the dishwasher to see if it drains properly.
- Inspect the Check ValveDo: Locate the check valve, usually near the drain pump. Ensure it allows water to flow in one direction only.Observe: Look for any signs of wear or damage.Means: If the check valve is faulty, it may need to be replaced.Next: Test the dishwasher to see if it drains properly.
- Examine the Control BoardDo: Check the control board for any signs of damage or malfunction.Observe: Look for burnt components or loose wires.Means: If the control board is faulty, it may need to be replaced.Next: Test the dishwasher to see if it drains properly.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain Filter Food particles and debris can accumulate, blocking water flow. | Common | Easy | None |
| Kinked or Clogged Drain Hose The hose can become kinked or clogged, preventing proper drainage. | Common | Easy–Medium | Drain Hose |
| Clogged Air Gap Debris can block the air gap, causing drainage issues. | Sometimes | Easy | None |
| Faulty Drain Pump The pump may fail or become obstructed, preventing water from being pumped out. | Sometimes | Medium | Drain Pump |
| Faulty Drain Valve The valve may not open or close properly, affecting drainage. | Sometimes | Medium | Drain Valve |
| Faulty Check Valve The check valve may allow water to flow back into the dishwasher. | Rare | Medium | Check Valve |
| Faulty Control Board The control board may malfunction, affecting the dishwasher's operation. | Rare | Hard | Control Board |
Parts matching
If you need to replace any parts, ensure they match your dishwasher's make and model. Always turn off power and water before replacing parts.
- Drain Filter
- Drain Hose
- Drain Pump
- Drain Valve
- Check Valve
- Control Board
Consult your dishwasher's manual for specific part numbers and compatibility.
When to call a professional
- If the dishwasher is still not draining after troubleshooting.
- If you're not comfortable performing the repairs yourself.
- If you encounter any electrical issues.
- If the dishwasher is under warranty.
- If you suspect a plumbing issue beyond the dishwasher.
- If you need professional advice or diagnosis.
FAQ
Why is my dishwasher leaving standing water?
Standing water in the dishwasher is often due to a clogged drain filter, kinked drain hose, or a faulty drain pump.
How do I clean the drain filter?
Remove the drain filter by turning it counterclockwise, clean it with warm, soapy water, and reinsert it by turning clockwise.
What should I do if the drain hose is kinked?
Straighten the kink in the drain hose and ensure it is properly connected. Replace the hose if it is damaged.
How do I know if the drain pump is faulty?
If the dishwasher makes unusual noises during the drain cycle and water remains, the drain pump may be faulty. Inspect it for obstructions or signs of failure.
Can I replace the drain pump myself?
Replacing the drain pump is a medium-difficulty task. If you're comfortable with DIY repairs, follow the manufacturer's instructions. Otherwise, call a professional.
What is the air gap and why is it important?
The air gap prevents wastewater from flowing back into the dishwasher. If it's clogged, it can cause drainage issues. Clean it regularly to ensure proper function.