Dishwasher Won't Drain: Troubleshooting Guide

Quick answer

First, check if the drain hose is clogged or kinked. Clear any blockages. If the issue persists, inspect the drain pump and filter. Always ensure the dishwasher is unplugged before starting any repairs.

Confirm the symptom

• Dishwasher cycle completes but water remains inside.
• Dishwasher makes unusual noises during the drain cycle.
• Dishes are not clean due to standing water.
• Error code related to draining appears on the control panel.
• Water leaks from the dishwasher during or after the cycle.

Tools and prep

• Screwdriver (Phillips and flathead)
• Pliers
• Bucket or towel to catch water
• Flashlight for better visibility
• New drain filter or pump if needed
• Unplug the dishwasher or turn off the circuit breaker
• Turn off the water supply valve under the sink

Step-by-step troubleshooting

1. Check the Drain Hose
   Do: Pull the dishwasher out from under the counter and locate the drain hose.
   Observe: Look for kinks, clogs, or damage.
   Means: If the hose is damaged or clogged, it needs to be replaced or cleared.
   Next: Check the Air Gap
2. Check the Air Gap
   Do: Locate the air gap on the countertop or sink.
   Observe: Remove the cap and check for food particles or debris.
   Means: If clogged, clean it out with a small brush or pipe cleaner.
   Next: Inspect the Drain Filter
3. Inspect the Drain Filter
   Do: Remove the lower rack and locate the filter at the back of the dishwasher.
   Observe: Check for debris or blockages.
   Means: Clean the filter thoroughly and reinstall it.
   Next: Check the Drain Pump
4. Check the Drain Pump
   Do: Access the drain pump, usually located at the bottom of the dishwasher.
   Observe: Look for debris or signs of failure.
   Means: If the pump is faulty, it may need to be replaced.
   Next: Check the Drain Valve
5. Check the Drain Valve
   Do: Locate the drain valve, often near the drain pump.
   Observe: Ensure it is opening and closing properly.
   Means: If the valve is stuck or damaged, it may need to be replaced.
   Next: Check the Check Valve
6. Check the Check Valve
   Do: Locate the check valve, usually near the drain hose.
   Observe: Ensure it is functioning correctly to prevent backflow.
   Means: If the check valve is faulty, replace it.
   Next: Test the Dishwasher
7. Test the Dishwasher
   Do: Reassemble the dishwasher and run a test cycle.
   Observe: Monitor the draining process.
   Means: If the dishwasher drains properly, the issue is resolved. If not, further inspection is needed.
   Next: None

Common causes

Parts matching

If you need to replace any parts, ensure they are compatible with your dishwasher model. Always turn off the power and water supply before starting any repairs.

• Drain Pump: Replaces a faulty pump that fails to drain water.
• Drain Filter: Cleans or replaces a clogged filter to improve draining.
• Drain Valve: Ensures proper opening and closing for effective draining.
• Check Valve: Prevents backflow and ensures proper water flow.
• Drain Hose: Replaces a damaged or kinked hose to restore water flow.

Keep a list of your dishwasher's model number and serial number handy for ordering the correct parts.

When to call a professional

• If the dishwasher still won't drain after troubleshooting.
• If you're not comfortable performing the repairs yourself.
• If you encounter electrical issues or sparks.
• If the dishwasher leaks excessively during the cycle.
• If you suspect a major component failure, such as the control board.

FAQ

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