Whirlpool Duet F21 Code: Causes & 9 Ways To Fix It Now

Have you just discovered that your Whirlpool Duet washing machine is displaying the F21 code? This is usually an indication of an underlying problem that requires immediate attention.

This code is an indication that there is a drain issue, and it usually displays when the machine is unable to drain water from the drum efficiently. But what exactly are the causes of this problem, and how can you fix it?

In this article, we will address all 9 possible causes of the problem and provide 9 comprehensive solutions to help you fix the problem once and for all. So read on to learn more about Whirlpool duet F21 codes and how to fix them!

Whirlpool Duet F21 Code
The Whirlpool Duet washer F21 code indicates that your washer has a drainage problem, which might be the result of a clogged filter, or it could be something more severe, like an insufficient water supply or a faulty water valve.

Causes of Whirlpool Duet F21 Code

Are you having trouble with your Whirlpool Duet washing machine displaying the F21 code? If so, you’re not alone. The Whirlpool Duet F21 code is a common problem that can be caused by various factors, and it’s important to understand what they are before attempting any washer repair.

Let’s cover all 9 possible causes of the Whirlpool Duet F21 code.

1. Faulty Drain Pump

A defective drain pump can spell disaster for your washing machine. As one of the critical components responsible for disposing of excess water, a malfunctioning drain pump can lead to a buildup of water in your machine and trigger the dreaded F21 code.

When this occurs, it’s critical to address the issue promptly to prevent water damage and operational malfunctions.

2. Clogged Pump Filter

When your washing machine displays the F21 code, you may panic and feel frustrated. However, don’t worry; a clogged pump filter is usually the culprit.

This issue commonly occurs when the filter becomes dirty or obstructed, reducing water flow into the drain pump. While it may seem daunting to troubleshoot the problem, it’s best to tackle it head-on by cleaning or replacing the filter.

3. Bent or Jammed Water Drain Lines

A clogged drain line is another common cause of the F21 code. The issue is typically triggered when the drain lines become twisted or obstructed, stopping water from flowing efficiently out of the pump.

Therefore, it’s essential to check and unclog any bent pipes or jammed lines that may be preventing proper drainage.

4. Damaged Drain Pump Wiring Harness

When confronted with the F21 code on your washing machine, a bad drain pump wiring harness could be the culprit. This issue occurs when the wiring harness connecting the pump to the main control board is damaged or has a communication error.

While it may seem like a simple issue, it can lead to bigger problems if ignored, such as water not draining properly from the machine. It’s always best to address any issues with your machine as soon as possible and enlist the help of a qualified professional to ensure a proper fix.

5. Blocked Drain Hose

If the drain hose is clogged or obstructed, it can cause slow draining or prevent water from flowing through it efficiently, resulting in the F21 code. If left unaddressed, this can lead to costly repairs or even damage to the machine.

It’s essential to take a professional approach when dealing with a clogged or obstructed drain hose to ensure efficient water flow and avoid any further complications.

6. Clogged Pressure Switch

The pressure switch is a critical component in your washing machine that helps maintain the correct water level during each cycle. However, you may start encountering the dreaded F21 washer error code if it becomes clogged or jammed.

This can be a frustrating problem, but it’s important to address it promptly to avoid further damage to your machine.

7. Damaged Control Board

The control board is an integral part of any machine, regulating its operations and ensuring everything runs smoothly. When the control board becomes damaged, it can significantly affect the functioning of the machine.

In the case of a washing machine, a damaged control board may result in an inability to control water capacity, leading to potential flooding or other issues.

8. Overloaded Machine

Overloading the washing machine is another reason that can lead to the F21 code. An overloaded machine leads to stress on the drum, and the machine may fail to drain water appropriately.

Therefore, it’s crucial to avoid overloading your washing machine and follow the instructions on the label for the best results.

9. Using the Wrong Detergent

Using the wrong types of detergent can cause the washing machine to display the F21 code. While it might be tempting to reach for whatever detergent is on sale, using the proper cleaning agent is crucial to keeping your washing machine functioning properly.

The wrong detergent can produce excess suds, leading to water flow obstruction and, ultimately, the F21 code.

How to Fix Whirlpool Duet F21 Code

The F21 code is a common issue with Whirlpool Duets, but there are some simple steps you can take to diagnose and fix the problems.

Let’s take a look at 9 comprehensive solutions on how to fix them.

1. Replace the Drain Pump

Suppose your Whirlpool washing machine’s drain pump is malfunctioning, and you want to avoid the F21 error code. In that case, some steps must be taken to replace the pump effectively.

First, unplug the machine and remove the bottom front panel, exposing the drain pump. Next, disconnect the hoses and electrical connections from the pump and unscrew them from the machine.

Replace it with a new drain pump and reattach the hoses and electrical connections. Finally, reattach the front panel, and your machine will work like before.

2. Clean or Replace the Pump Filter

The Whirlpool Duet washer also has a filter at the bottom of the machine that can become clogged over time.

To fix this, locate the drain pump filter on the machine’s lower side. Open the filter, clean it with a toothbrush, and rinse it with warm water. Re-install the filter after cleaning and run the washing machine to see if the problem is fixed.

3. Check Water Drain Lines

A clogged drain water line could be another potential cause of the Whirlpool Duet F21 code. To fix this, you need to check the inlet hoses connected to the machine, as they may be responsible for blocking or restricting the water flow and preventing it from draining correctly.

Check whether there is any obstruction in the hoses, and if so, clear the blockage to get rid of the whirlpool duet F21 code. It is also recommended that you check for any kinks in the drain line or clogged filters, as these can be contributing factors.

4. Replace the Drain Pump Wiring Harness

If the wiring harness of your Whirlpool washing machine is damaged, it can lead to the F21 error code. To replace it,  disconnect the machine from the electricity and open the bottom panel.

Find the faulty wiring harness and remove it carefully without damaging any other parts. Install a new wiring harness in its place and reconnect everything.

Finally, secure the bottom panel with screws and plug the machine back in. This should resolve the issue.

5. Inspect the Drain Hose

Ensuring your drain hose is in good condition is crucial to ensuring your appliances operate efficiently. To inspect the drain hose, start by unplugging the appliance from the power source to avoid accidents.

Disconnect the hose from the outlet to access it fully. Look for any signs of cracks, wear and tear, or cuts on the hose, paying attention to where it connects to the appliance and the outlet.

Check for any signs of blockages, such as lint, loose debris, or foreign objects that may prevent proper water flow. If you notice any issues during your inspection, take the necessary steps to repair or replace the hose to prevent water damage and costly repairs in the future.

6. Clean the Pressure Switch

If the pressure switch of your washing machine is blocked or clogged, it can cause the Whirlpool Duet F21 code. To clean the switch, turn off the power to the device and remove any obstructions from around it before disconnecting the hoses.

Next, open up the pressure switch to expose its components and use a vacuum cleaner to remove any dirt or foreign debris.

Reattach the hoses and check for any leakage before running a test drain cycle with your machine. If the Whirlpool Duet F21 code persists, you may need to replace the pressure switch altogether.

7. Replace the Control Board

Another cause of the Whirlpool Duet F21 code is an issue with the control board. To replace it, first, unplug the washing machine from electricity and remove the back panel to access the board.

Check for burnt or melted wires on the board, indicating a possible short circuit. If this is the case, you should replace the board with a new one.

Install the new board and reconnect all the wiring before attaching the back panel, and your machine should work correctly again.

8. Reduce the Load

If all else fails, you should reduce your washing machine’s load to see if that solves the Whirlpool Duet F21 code issue.

The F21 error code can be triggered by excess laundry in the drum, and reducing it may help resolve this issue. If this works, you can gradually increase the load until your machine works as it should.

Avoid overloading the drum with laundry and ensure that all garments are evenly distributed for a more efficient normal wash cycle.

9. Use the Right Detergent

Using the wrong detergent can contribute to the Whirlpool Duet F21 code. To avoid this, ensure you use high-efficiency detergents.

Always check your machine’s recommended cleaning agents and stick to those for optimal performance.

These are just some potential causes of the Whirlpool Duet F21 code and different ways to fix them. If you have any further inquiries about the F21 code, contact a qualified technician for help.

Preventing Whirlpool Duet F21 Error Code

Preventing the Whirlpool Duet washer F21 code error from happening again is crucial to ensuring that your washer runs smoothly and effectively in the long term.

This issue can occur due to a wide range of factors, including insufficient water supply, a faulty water valve, or even clogged filters. To avoid this problem in the future, it’s crucial to regularly maintain your washer by cleaning the drain filters and ensuring that the water supply is adequate.

Additionally, make sure to follow the manufacturer’s instructions for load size and detergent usage to avoid other issues that may lead to the F21 code error. With proper care and attention, you can prevent this error and keep your washer running efficiently for years to come.

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