# How to Fix Whirlpool Washing Machine Error F21 (Long Drain Time)
The F21 error code is one of the most common warnings on modern Whirlpool washing machines, including Duet and Cabrio models. It signifies that the machine is experiencing a major drainage failure.
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## What Does the F21 Error Code Mean?
The F21 error code indicates a **Long Drain Time** fault.
In simple terms, the washing machine attempted to empty the water from the tub, but the water level switch (pressure sensor) did not detect a sufficient drop in the water level within the programmed time limit (usually 6–8 minutes).
**Likely Cause:** The drain pump is unable to push water out fast enough, or at all, usually due to a severe blockage or mechanical failure.
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## Step-by-Step Fix: How to Diagnose and Clear the F21 Error
**⚠️ Safety First:** Always unplug the washing machine from the power outlet before inspecting or attempting any repairs, especially when dealing with water and internal components.
### Step 1: External Hose Check (The Easiest Fix)
Before disassembling the machine, check the external factors:
1. **Check the Drain Hose:** Ensure the hose running from the back of the washer to the laundry tub or standpipe is not kinked, crushed, or pushed too far down into the drain pipe (which can create a siphon blockage).
2. **Check the Standpipe/Sink:** Ensure the external drain itself is not clogged. Pour a bucket of water down the drain to verify it clears quickly.
### Step 2: Clear the Drain Pump Filter (The Most Common Solution)
The most frequent cause of F21 is debris clogging the drain pump filter (often called the “coin trap”).
1. **Locate the Access Panel:** On most front-load Whirlpool washers, the drain pump filter is located behind a small rectangular access panel at the very bottom front of the machine. Use a flathead screwdriver or coin to pry this panel open.
2. **Prepare for Water:** Have shallow pans and towels ready, as several gallons of water may be trapped inside the tub.
3. **Drain the Water:** Twist the small drain hose (often capped) attached near the filter counter-clockwise to drain most of the residual water into your pan.
4. **Remove the Filter:** Once the water is drained, slowly twist the large filter cap counter-clockwise to remove it.
5. **Clear Debris:** Remove any items found in the trap (coins, keys, small socks, lint clumps, or hair). Use a flashlight to ensure the housing behind the filter is completely clear.
6. **Reinstall:** Re-insert the clean filter and cap the drain hose securely.
### Step 3: Inspect the Drain Pump Impeller
If the filter was clear, the blockage might be right at the impeller (the spinning blade inside the pump):
1. **Test for Free Movement:** With the filter removed, reach into the pump housing and manually push the impeller blade. It should spin freely.
2. **Remove Internal Blockage:** If the impeller is stiff or stuck, it likely has a piece of clothing, underwire, or large debris wrapped around it. Carefully remove any obstruction.
### Step 4: Check Internal Hoses and Sump
If the pump impeller spins freely and the filter is clear, the blockage may be further up in the internal hoses leading from the tub to the drain pump (the sump hose).
* *Note:* This step usually requires tilting the machine back or removing the front panel to access the hose clamps, as the pump assembly itself must be disconnected to inspect the hoses leading into it.
### Step 5: Test and Replace the Drain Pump (If All Else Fails)
If the entire drainage path is verified clear (hoses, filter, impeller), the pump motor itself has likely failed.
The drain pump is an electromechanical device. Over time, the motor can fail, or the impeller can become detached from the motor shaft. In this case, the pump sounds like it’s running (buzzing or humming) but produces little to no flow, or it may not run at all.
Replacing the drain pump is required if you confirm:
1. There are no blockages.
2. The pump is receiving voltage (professional diagnosis required).
3. The pump does not function or runs weakly.
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### Replacement Part Information
If you have confirmed that the drain pump is the issue, you will need to replace the component.
Check the price for a replacement Drain Pump here: https://www.amazon.com/s?k=Whirlpool+Drain Pump&tag=trivian-20