Whirlpool Duet Error F21: Long Drain Time

The Logic Verdict

My Take: F21 is the most common error on Whirlpool Duet washers. 90% of the time, it’s just a clogged coin trap (drain filter). The video also highlights a pro tip: removing the “eco ball” from the sump hose, which can get sticky and cause intermittent drain issues. Start by cleaning the filter before buying any parts.

What It Means

F21 = Long Drain. The pressure switch has not reset to “empty” within the allowed time (usually 8 minutes).

Potential Causes

1. Clogged Drain Filter: Coins, bobby pins, or socks blocking the pump.
2. Obstructed Drain Hose: Kinks or clogs in the wall drain.
3. Eco Ball Stuck: The plastic ball in the sump hose can get stuck (as shown in the video).
4. Failed Drain Pump: The pump motor has burned out or the impeller is broken.

Step-by-Step Troubleshooting

1. Empty the Water: If the door is locked full of water, you’ll need to manually drain it via the filter (have towels ready!).
2. Clean the Filter: Remove the bottom panel (3 screws), unscrew the large round cap (coin trap), and remove debris.
3. Check Impeller: Spin the pump impeller with your finger. It should have a magnetic “thump-thump” resistance. If it spins freely or is seized, replace the pump.
4. Remove Eco Ball: If the problem persists intermittently, remove the black rubber boot from the tub to the pump and remove the plastic ball inside.
5. Check Hoses: Ensure the drain hose isn’t shoved too far down the standpipe (siphoning) or kinked.

Resources

• Whirlpool Duet Drain Pumps (Amazon)
• Shop Vacs for Water Removal (Amazon)