What is the Whirlpool F21 Error Code and How to Fix It?

Seeing the F21 error code on your Whirlpool washing machine can be really frustrating, especially when you’re in the middle of laundry. This code usually means the washer is having trouble draining water properly, which can stop your laundry process. While this may seem like a serious problem at first, the F21 error is often due to common and fixable issues like a clogged drain filter, a blocked hose, or a slow-draining pump.

You don’t always need a technician to fix things. With some guidance and the right steps, most homeowners can solve this error themselves. In this blog, we’ll explain what the F21 code means, what might be causing it, and how you can troubleshoot and fix the issue safely and efficiently.

What is an F21 Error Code?

The F21 error shows up when your Whirlpool washer takes too long to drain water, usually more than 8 minutes. This can cause water to stay in the drum, clothes to get soaked, or the washer to stop mid-cycle. The issue usually comes from:

• A clogged drain filter or pump
• A kinked or blocked drain hose
• A broken drain pump
• Heavy or unbalanced loads

Fortunately, most of these problems are easy to fix at home with some basic tools and safety precautions.

Whirlpool Washer Code F21 Error: Causes and Fixes

When your Whirlpool washer shows the F21 error code, it means there is a long drain time, usually over 8 minutes. This issue stops the cycle from completing properly and can leave your clothes sitting in water. Below are the most common causes of the F21 error and how to fix each one.

1. Clogged Drain Pump Filter

The main reason for the F21 code is a clogged drain pump filter. Over time, small items like lint, coins, hair, and fabric threads can build up in the filter and limit water flow. When the pump has trouble pushing water through this blockage, the washer times out and displays the F21 error. Cleaning the drain filter regularly is crucial to avoid this issue.

How to Fix:

• Unplug the washer.
• Open the front bottom panel to access the drain filter.
• Place a towel and a shallow pan underneath.
• Unscrew the filter cap and remove debris.
• Rinse the filter thoroughly and reattach it.

2. Blocked or Kinked Drain Hose

If the drain hose is bent, kinked, or clogged, water can’t exit the washer properly. This backup increases drain time and may trigger the F21 error. Sometimes, soap scum and lint buildup inside the hose can also create partial blockages.

How to Fix:

• Disconnect the washer from power.
• Pull the washer forward to inspect the hose.
• Straighten any kinks and ensure the hose is not crushed.
• Remove the hose and run water through it to clear clogs.
• Reconnect securely and check for leaks.

3. Faulty Drain Pump

If the drain pump motor is damaged or burned out, it won’t have enough power to expel water. Debris caught inside the pump impeller can also stop it from working. In either case, the washer may continue to drain until it times out, leading to an F21 error.

How to Fix:

• Unplug the machine.
• Access the pump, which is usually near the drain filter.
• Listen for strange sounds. Buzzing or humming may indicate a jam.
• Remove debris from the pump impeller.
• If the pump doesn’t run at all, you might need to replace it.

4. Excessive Suds or Heavy Loads

Using too much detergent or overloading the washer with bulky or unbalanced items can cause suds or water to stay behind. This slows drainage and triggers the F21 code. Excess suds can also confuse sensors and extend drain times unnecessarily.

How to Fix:

• Use only HE (High Efficiency) detergent in the recommended amount.
• Reduce the load size, especially for towels or comforters.
• Run a rinse/spin cycle to clear out excess suds.
• Wipe down the drum and door seal to remove buildup.

5. Pressure Switch or Control Board Malfunction

In rare cases, a faulty pressure switch or control board may send incorrect signals, making the washer think it hasn’t drained even if it has. This can be a more complex issue that needs technical help.

How to Fix:

• Try resetting the washer by unplugging it for 1 to 2 minutes.
• Run a diagnostic cycle if your model allows it.
• If the error comes back after all cleaning steps, call a qualified technician.
• You may need to replace the control board or pressure sensor.

If the Issue Stills Persists, Call Appliance Medic

If you’ve cleaned the drain pump filter, checked the hose, and ruled out excess suds or pump failure, but the F21 error keeps appearing, it’s time to call in the professionals. Appliance Medic has experienced technicians who can diagnose deeper issues like control board problems, faulty sensors, or damaged wiring. Trying to fix complex repairs without the right tools or skills can make the issue worse. For quick, dependable washing machine repair service and lasting solutions, schedule a visit with Appliance Medic to get your washer working like new again.