Whirlpool Duet F21 Error: Drain Pump Motor Test and... | appliancefaults.com

Technical Background:

The Central Control Unit (CCU) monitors the drain pump's operation. When the CCU detects that the water level hasn't decreased within a specific timeframe during the drain cycle, it assumes a problem exists and triggers the F21 error. This error signifies a slow or failed drain. The CCU sends 120V AC to the drain pump motor. If the pump fails to respond or the CCU doesn't detect a change in the water level sensor, it throws the F21 error.

Symptoms:

The washer displays an F21 error code and fails to drain water. The wash cycle may stop prematurely, leaving clothes soaking wet in the drum. You might hear a humming sound from the pump area but no water is being pumped out.

Possible Causes:

Clogged drain pump filter.
Blocked drain hose.
Faulty drain pump motor.
Wiring harness issue to the drain pump.
Failed Central Control Unit (CCU).

Solution:

1

Unplug the washer from the outlet or turn off the breaker.
2

Locate the drain pump, typically behind an access panel at the bottom front of the washer. You may need a 1/4-inch nut driver.
3

Inspect the drain pump filter for debris. Remove and clean if necessary. Use pliers to remove stubborn objects.
4

Disconnect the drain hose from the drain pump and check for any blockages. A long screwdriver can help dislodge debris.
5

Using a multimeter, check for 120V AC at the drain pump connector during the drain cycle. Set multimeter to AC voltage. If no voltage is detected, investigate the wiring harness and the CCU.
6

If voltage is present but the pump isn't running, replace the drain pump. A new pump may include system instructions.
7

If no voltage is present, inspect the wiring harness and connections to the CCU. If the wiring is good, the CCU may be faulty and need replacement.

Safety Warning:

Disconnect power to the washer before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures. High voltage is present in the control circuits; exercise caution when testing electrical components.

Prevention:

Regularly clean the drain pump filter every 3-6 months to prevent clogs. Avoid overloading the washer and ensure small items like socks don't get into the pump area. Periodically inspect the drain hose for kinks or damage.

Expert Tip:

To manually activate the drain pump for testing (service mode), with the washer off, press and hold the Start/Pause button and then press the Power button. Then press the following sequence: Start/Pause, Up Arrow, Down Arrow, Start/Pause. Rotate the cycle selector knob to the Drain/Spin cycle and press Start/Pause. This will activate the drain pump so you can test voltage with a multimeter.

Frequently Asked Questions

•How do I access the drain pump on my Whirlpool Duet washer?

The drain pump is typically located behind a service panel at the bottom front of the washer. You'll usually need to remove a few screws with a 1/4-inch nut driver to access it. Be prepared for some water to spill out when you open it.

•Where is the Central Control Unit (CCU) located, and how do I test it?

The CCU is typically located behind the control panel at the top of the washer. Testing it requires a multimeter and knowledge of electronics. Due to the complexity, it's best left to a qualified technician unless you have extensive electrical experience.

•What is the part number for a replacement drain pump for my Whirlpool Duet washer?

The part number depends on your specific model number. Locate your washer's model number (usually on a sticker inside the door or on the back panel) and search online appliance parts websites (like AppliancePartsPros, RepairClinic, or Sears Parts Direct) for the correct drain pump for your model.

Whirlpool Duet F21 Error: Drain Pump Motor Test and Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump on my Whirlpool Duet washer?

•Where is the Central Control Unit (CCU) located, and how do I test it?

•What is the part number for a replacement drain pump for my Whirlpool Duet washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: