What is the F21 Error Code on Your Whirlpool Washer?

Technically Reviewed by Oleg Chudnovski, CEO on May 22, 2025 | Written by Fix Appliances CA Editorial Contributors

If you’re dealing with an F21 error code on your Whirlpool washer, rest assured that this is a common issue many users experience. The F21 code signals a drainage problem, meaning your washer has trouble properly removing water. Fortunately, this issue often has straightforward solutions you can try before calling a professional. This guide will walk you through understanding the F21 code, identifying common causes, and tackling potential washing machine repairs.

What Does F21 Mean on a Whirlpool Washer?

The F21 error code indicates a drainage problem: the washer cannot expel water as it should. This issue may be due to various factors, from a drain pump or hose blockage to a malfunctioning lid switch assembly. While it may seem complex, basic troubleshooting often resolves the most common causes.

Common Causes of the F21 Error Code

Understanding the likely culprits behind the F21 code can help you take practical steps toward a solution. Here are the most common causes:

1. Blocked Drain Pump

Small items like socks or coins can sometimes bypass the washer drum and become lodged in the drain pump, causing a blockage that prevents water from draining. If not promptly addressed, this can lead to further issues.

• Solution: Disconnect the power, locate the drain pump according to your model’s user manual, and check for any debris or foreign objects inside. Use caution when inspecting, and remember to have a small bucket or towel handy to catch any excess water.

2. Clogged Hoses

The hoses connected to your washer, both internal and external, are critical for proper drainage. Over time, these hoses can accumulate lint, small clothing items, or even mineral deposits, obstructing water flow.

• Solution: Disconnect the hoses connected to the pump and inspect them for blockages. If necessary, use a narrow brush to clean inside the hoses, ensuring they’re not kinked or bent, which can restrict water flow. Reconnect the hoses carefully to avoid leaks.

3. Faulty Lid Switch Assembly

The lid switch assembly is a safety feature that halts the spin cycle if the lid is open. If this switch malfunctions, it can incorrectly signal that the lid is open, preventing proper drainage.

• Solution: Test the lid switch assembly with a multimeter to check for continuity. If any switch shows a lack of continuity, it may need replacement. This task may require more technical knowledge, so consult your model’s manual or a professional Spark Service PRO team.

How to Fix the F21 Error Code on Your Whirlpool Washer

After understanding the causes, you can follow these steps to address the F21 error on your Whirlpool washer. Remember, safety comes first—always disconnect the power before beginning any repairs.

1. Start with the Drain Pump

• Check for obstructions like coins, lint, or small clothing items. Carefully remove anything that may be blocking the pump. If the pump is clear but emits unusual sounds during operation, this may indicate it’s time for a replacement.

2. Inspect the Hoses

• Disconnect both the internal pump hose and any external hoses. Check for clogs, clear them out if necessary, and ensure all hoses are free of kinks that could obstruct water flow.

3. Test the Lid Switch Assembly

• If your model has a lid switch, use a multimeter to test each switch for continuity. If any switch fails the continuity test, replacing it could resolve the drainage issue.

By following these steps, you may be able to clear the F21 error without professional intervention. This will save you time and money and help you become more familiar with your appliance’s basic maintenance needs.

Preventing Future F21 Error Codes

Once you’ve resolved the F21 error code, consider these preventive measures to keep your washer in good condition:

• Regularly Clean the Drain Pump Filter: Aim to check and clean the filter monthly to prevent build-up.
• Inspect and Clean Hoses: Ensure hoses are free from kinks and blockages to support proper water flow.
• Use Garment Bags for Small Items: Place small items in mesh laundry bags to keep them from causing clogs within the pump or hoses.

Regular maintenance is key to preventing the F21 error code on your Whirlpool washer. By routinely cleaning the drain pump filter and inspecting hoses for clogs or kinks, you can ensure efficient water flow and avoid many common drainage issues.

- Oleg Chudnovski, SEO

What is the F21 Error Code on Your Whirlpool Washer Still Appears?

Although the F21 error code on a Whirlpool washing machine can be inconvenient, it’s usually fixable with a few troubleshooting steps. Understanding the common causes and how to address them can quickly restore your washer to optimal performance. Regular maintenance and preventative care can minimize the chances of encountering this issue in the future. Whirlpool Canada highly recommends applying all those steps from our topic.

At Spark Service PRO, part of Fix Appliances CA Inc., we aim to keep your Washing machine running safely and efficiently. If you’re experiencing issues with your appliance or have questions about maintenance, call us at 647-503-6655 today. We’re here to help with expert appliance services in Toronto, the Great Toronto and Simcoe County areas.