F4
Whirlpool Dishwasher
Severity: ModerateWhat Does This Error Mean?
The F4 error means your Whirlpool dishwasher has a drain pump problem. The machine tried to drain the water but the pump is not working correctly. Standing water will remain in the bottom of the tub until this is fixed. A blocked pump filter or a faulty drain pump are the most common causes.
Affected Models
- WDT750SAHZ
- WDT970SAHZ
- WDF520PADM
- WDTA50SAHZ
- Many Whirlpool dishwasher models
Common Causes
- Clogged drain pump filter blocked by food debris, glass, or small items
- Drain hose kinked, pinched, or blocked preventing water from exiting
- Drain pump impeller jammed by a foreign object
- Faulty drain pump motor that is no longer spinning
- Blocked or slow household drain causing water to back up into the dishwasher
How to Fix It
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Cancel the current cycle and let the dishwasher drain completely if possible.
Press Cancel to activate the drain cycle. If the pump is still partially working, this will remove most of the standing water before you begin cleaning.
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Remove the bottom rack and clean the filter assembly.
Twist out the cylindrical filter at the bottom of the tub. Under it is the flat mesh filter — remove both and rinse under running water. Clean the filter housing area with a damp cloth.
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Check the drain pump area for foreign objects.
With the filter removed, look into the pump opening at the bottom of the tub. Use a flashlight. Carefully remove any debris, glass fragments, or small items you find.
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Check the drain hose at the back of the dishwasher.
Pull the dishwasher out slightly and inspect the drain hose. It should have a smooth path to the drain connection under the sink with no sharp kinks or crushing.
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Reassemble, run a short cycle, and check if F4 clears.
If the error returns after cleaning the filter and checking the hose, the pump motor has likely failed. Call a technician.
When to Call a Professional
If cleaning the filter and hose doesn't fix F4, the drain pump likely needs replacing. Drain pump replacement requires removing the dishwasher's lower panel and pump assembly. A licensed appliance technician can replace the pump and clear any hidden blockages. Expect repair costs of $100–$250 for a drain pump replacement.
Frequently Asked Questions
How often should I clean the Whirlpool dishwasher filter?
Once a month is ideal for most households. If you skip pre-rinsing dishes or run the dishwasher daily, clean it every two weeks. A clean filter prevents F4 errors and keeps the drain pump running efficiently. It takes about 2 minutes and requires no tools.
What if there's still standing water after I clean the filter?
If water remains after the filter is clean and the hose is clear, the pump motor has likely failed. You can manually remove the water with a turkey baster or small cup and sponge. Then call a technician to replace the drain pump before running another cycle.
Can a blocked sink drain cause the F4 error?
Yes — if the drain line under your kitchen sink is partially blocked, the dishwasher's water can't flow out properly. Test this by running your kitchen sink and checking if it drains slowly. If the sink drain is slow, clear the household drain first before troubleshooting the dishwasher.