Why Is My Whirlpool Dishwasher Not Draining?
Your Whirlpool dishwasher failing to drain is likely due to a simple blockage, often in the drain filter, drain hose, or air gap. While less common, a faulty drain pump or control board can also be the culprit, requiring professional attention for effective repair.
Understanding Dishwasher Drainage Issues
A dishwasher that stubbornly refuses to drain is a common household frustration. While it might feel like a major catastrophe, the problem often stems from a relatively straightforward issue. Understanding the drainage system and the potential culprits can empower you to troubleshoot and potentially resolve the problem yourself, saving time and money. Whirlpool dishwashers, like most modern models, rely on a pump to expel water after each wash cycle. When that pump is hindered, or the path to the drain is obstructed, the standing water remains.
Common Causes of Drainage Problems
Several factors can contribute to a Whirlpool dishwasher’s drainage woes. Identifying the most likely cause is the first step toward a solution.
- Food Debris: This is the most frequent offender. Leftover food particles, especially larger chunks, can clog the drain filter, drain pump, or drain hose.
- Clogged Drain Filter: The drain filter is designed to trap larger food particles. If it becomes excessively clogged, it will restrict water flow.
- Kinked or Clogged Drain Hose: The drain hose carries wastewater from the dishwasher to the sink drain or garbage disposal. Kinks, bends, or clogs in the hose can impede drainage.
- Clogged Air Gap: The air gap, if present, prevents wastewater from flowing back into the dishwasher. It can become clogged with food debris or mineral buildup.
- Faulty Drain Pump: The drain pump is responsible for actively pumping water out of the dishwasher. If the pump fails, water will not drain.
- Defective Check Valve: The check valve prevents backflow of water into the dishwasher. A malfunctioning check valve can prevent proper drainage.
- Control Board Issues: In rare cases, a faulty control board can prevent the drain pump from activating.
Troubleshooting Steps: A Step-by-Step Guide
Here’s a systematic approach to diagnosing and resolving a Whirlpool dishwasher drainage problem. Always disconnect the dishwasher from the power supply before attempting any repairs.
Check the Drain Filter:
- Locate the drain filter at the bottom of the dishwasher tub.
- Remove the filter and rinse it thoroughly under running water to remove any debris.
- Use a brush to scrub away stubborn buildup.
- Reinstall the filter securely.
Inspect the Drain Hose:
- Locate the drain hose, typically connected to the sink drain or garbage disposal.
- Check for kinks or bends that might be restricting water flow. Straighten any kinks.
- Disconnect the hose and inspect it for clogs. Use a long, flexible brush or a wire coat hanger to clear any blockages.
- Reconnect the hose securely.
Examine the Air Gap (if present):
- Locate the air gap, usually mounted on the sink or countertop near the dishwasher.
- Remove the air gap cover and inspect it for clogs.
- Use a small brush or pipe cleaner to remove any debris.
- Reassemble the air gap.
Test the Drain Pump (advanced):
- This step requires some mechanical aptitude. Locate the drain pump, typically at the bottom of the dishwasher.
- Visually inspect the pump for any signs of damage or obstruction.
- Using a multimeter, check the pump for continuity. If there’s no continuity, the pump likely needs to be replaced.
- If the pump is accessible, try manually rotating the impeller (the rotating part of the pump) to see if it’s stuck.
Check the Check Valve (advanced):
- The check valve is usually located near the drain pump or within the drain hose assembly.
- Inspect the check valve for any signs of damage or debris.
- Ensure the valve moves freely and is not stuck in the closed position.
Reset the Dishwasher:
- Try resetting the dishwasher by turning off the circuit breaker for a few minutes, then turning it back on. This can sometimes clear minor electronic glitches.
Preventing Future Drainage Issues
Proactive measures can significantly reduce the likelihood of future dishwasher drainage problems.
- Scrape Plates Thoroughly: Remove as much food debris as possible from dishes before loading them into the dishwasher.
- Regularly Clean the Drain Filter: Clean the drain filter at least once a month to prevent buildup.
- Avoid Overloading the Dishwasher: Overloading can prevent dishes from being properly cleaned, leading to more food particles in the drainage system.
- Use a Quality Dishwasher Detergent: Some detergents are more effective at breaking down food particles.
When to Call a Professional
While many drainage issues can be resolved with some DIY troubleshooting, certain situations warrant professional assistance.
- If you suspect a faulty drain pump or control board.
- If you’ve tried all the troubleshooting steps and the dishwasher still isn’t draining.
- If you’re uncomfortable working with electrical components.
Frequently Asked Questions
Why is my dishwasher making a humming noise but not draining?
A humming noise coupled with a lack of drainage often indicates that the drain pump is struggling to operate, potentially due to a blockage. Check the drain filter and drain hose for obstructions. If the humming persists after clearing any blockages, the drain pump itself may be faulty and require replacement.
Can I use a chemical drain cleaner in my dishwasher?
Avoid using chemical drain cleaners in your dishwasher. They can damage the dishwasher’s internal components, particularly plastic parts and rubber seals. Physical removal of debris is always the preferred method.
How do I clean the air gap on my Whirlpool dishwasher?
To clean the air gap, remove the cap and use a small brush or pipe cleaner to clear any accumulated debris inside the air gap body. Rinse thoroughly with water. This typically resolves blockages caused by food particles and mineral buildup. Regular cleaning prevents backflow contamination.
What is the black rubber thing in my dishwasher drain?
That’s most likely the check valve, which prevents wastewater from flowing back into the dishwasher. It’s designed to allow water to flow only in one direction. Inspect the valve for damage or debris that might be preventing it from sealing properly.
My dishwasher drains partially, then stops. What’s the problem?
Partial draining often suggests a partial blockage that restricts water flow but doesn’t completely prevent it. The drain filter, drain hose, or air gap are the most likely suspects. Thoroughly cleaning these components can often resolve the issue.
How often should I clean my dishwasher drain filter?
Cleaning the drain filter at least once a month is recommended. However, if you frequently wash heavily soiled dishes, you may need to clean it more often. Regular cleaning prevents clogs and maintains optimal drainage performance.
Can a kinked drain hose cause drainage problems?
Yes, a kinked drain hose can significantly restrict water flow and prevent proper drainage. Ensure the drain hose is straight and free from any kinks or bends. If necessary, replace the hose with a new one.
Is it normal for some water to remain in the bottom of the dishwasher after a cycle?
A small amount of water (typically less than an inch) is sometimes normal and helps to keep the pump seals lubricated. However, a significant amount of standing water indicates a drainage problem.
How do I know if my dishwasher drain pump is bad?
Signs of a bad drain pump include a humming noise without draining, no noise at all, or water remaining in the dishwasher after the cycle completes. You can also test the pump for continuity using a multimeter.
Why is my new Whirlpool dishwasher not draining properly?
Even new dishwashers can sometimes experience drainage problems. Check for shipping materials or packing inserts that may be obstructing the drain hose or filter. Also, ensure the drain hose is properly connected and not kinked.
How much does it cost to replace a dishwasher drain pump?
The cost to replace a dishwasher drain pump can vary depending on the model and whether you hire a professional. Parts typically range from $50 to $150, while labor can add another $50 to $200. DIY replacement can save on labor costs but requires some mechanical skill.
My dishwasher has a garbage disposal connection. Could that be the problem?
Yes, a clogged garbage disposal can prevent the dishwasher from draining properly. Run the garbage disposal for a few minutes before running the dishwasher to clear any potential blockages. Ensure the knockout plug in the garbage disposal inlet (where the dishwasher drain hose connects) has been removed.