How To Replace Your Whirlpool Washer Drain Pump

Quick Answer: Replacing your Whirlpool washer's drain pump takes 45-60 minutes with basic tools. Before buying a new pump, clean the pump filter (the #1 cause of F21 — resolves 60% of cases without buying anything). If the problem persists, the WP3363394 (top-load) or WPW10730972 (front-load) pump costs $30-55 and permanently resolves F21/F9 E1 codes.

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Main Symptom: Washer not draining, F21 or F9 E1 code, standing water at the end of the cycle.

Repair Time: 45-60 minutes.

Difficulty: Medium — requires opening panels and disconnecting hoses.

Part Cost: $30-55 OEM.

When your Whirlpool washer stops draining, the drain pump is the culprit in 30-40% of cases. Before jumping to that conclusion, this guide will show you how to rule out a clogged filter (more common) and confirm that the pump is the actual problem — so you don't buy a part you don't need.

Pre-diagnosis — do you really need a new pump?

Before buying any parts, complete these three steps:

Step A — Clean the pump filter (free, 10 minutes)

The drain pump filter in Whirlpool front-load washers often gets clogged with lint, coins, and small objects. A clogged filter causes the exact same F21 code as a faulty pump.

How to clean the filter:

1. Open the lower front panel of the washer (2 Phillips screws or simply pull it towards you on screwless models).
2. You'll see a round cap with a coin slot or a small hose with a plug next to it.
3. Place a low bucket underneath.
4. If there's a small hose: pull the plug to drain the water first.
5. Slowly turn the filter cap counter-clockwise — residual water will come out, control it with the bucket.
6. Remove the filter completely. Clean any debris under running water. Check that the impeller (blades inside the compartment) spins freely with your finger.
7. Reinstall the filter, ensuring it's tightly closed.
8. Run an empty Spin Only cycle.

If it now drains normally: the pump is fine, don't buy a new one. The filter was the problem.

If it still doesn't drain or the F21 code returns: Continue to the pump diagnosis.

Step B — Test the pump with a multimeter (5 minutes)

If you want to confirm the pump is faulty before buying it:

1. Unplug the washer.
2. Access the pump's electrical connector (see access section below).
3. Disconnect the pump's electrical connector.
4. Set your multimeter to continuity mode (ohms).
5. Place the probes on the two terminals of the pump connector.
6. Expected reading: 5-10 ohms (continuity).
7. No continuity or infinite reading: The pump is faulty — replace it.

Step C — Listen during the drain cycle

Without opening anything: start a wash cycle, wait for the drain phase, and listen:

• Loud hum but no draining: The pump motor is running, but something is blocking the impeller (stuck object) or the impeller is broken. Clean the filter/impeller first.
• No draining sound: The pump isn't receiving an electrical signal, or the motor is burned out.
• Scraping or squealing noise: The impeller has an object stuck in it, damaging the blades.

Tools and parts needed

Which pump does your washer need?

How to confirm the correct part number: Locate your washer's model number tag (door frame or rear panel, format WTWxxxx or WFWxxxx) and compare it with the part's compatibility list on Amazon.

View WP3363394 pump for Whirlpool top-load washer →

View WPW10730972 pump for Whirlpool front-load washer →

Complete Procedure — Front-Load Washer (Duet / WFW)

Preparation

1. Unplug the washer from the wall outlet.
2. Shut off the water supply (hot and cold) behind the washer.
3. Drain residual water first:

- Open the lower front panel.

- Pull the plug from the emergency drain hose (small hose next to the filter).

- Let the water drain into a bucket — expect 0.8-2.1 gallons.

- Then close the plug and slowly open the filter to drain the rest.

Accessing the pump

Option 1 — Through the lower front panel (WFW models with access panel):

1. Remove the Phillips screws from the lower front panel (usually 2 screws at the bottom).
2. The panel tilts forward and down.
3. The drain pump is visible on the lower right side — black or gray body with two hoses connected.

Option 2 — Through the rear panel (if front access is limited):

1. Move the washer forward to access the rear.
2. Remove the screws from the rear panel (usually 6-8 Phillips screws around the edge).
3. The entire rear panel comes off.
4. The pump is visible on the lower right.

Replacing the pump

1. Take a picture of the current setup before disconnecting anything — a reference photo speeds up reassembly.

1. Disconnect the electrical connector:

- Press the safety tab (clip on the side of the connector).

- Pull the connector straight out — do not twist it.

1. Loosen the hose clamps:

- There are two hoses connected to the pump.

- Use pliers to compress the ears of the spring clamp and slide it back along the hose.

- If they are screw clamps: turn the screw until loose.

- Pull each hose off with a gentle twisting motion. They might be stuck — use a flat-head screwdriver to break the seal.

1. Remove the pump mounting screws:

- Usually 2-3 Phillips or hex-head screws.

- The pump detaches from the washer's chassis.

1. Install the new pump:

- Position the new OEM pump in the same orientation as the old one (compare with your photo).

- Screw in the mounting screws — tighten firmly but don't overtighten.

- Reconnect the hoses — push firmly until they pass the retaining ring. Slide the spring clamps back over the hose (above the pump's retaining ring).

- Connect the electrical connector until it clicks into place.

1. Check for twisted hoses or loose connections.

Complete Procedure — Top-Load Washer (WTW)

Whirlpool top-load washers have pump access either through the rear panel or from underneath the tub.

Rear panel access (most common)

1. Unplug and shut off water supply.
2. Move the washer forward to access the rear.
3. Remove the rear panel:

- Usually 2-4 Phillips screws at the top of the rear panel.

- The panel tilts back and lifts off.

1. Locate the pump: It's at the bottom of the chassis, connected to the drain hose.
2. Follow the same disconnection steps for hoses and electrical connector described above.
3. Remove the mounting screws (2-3 screws).
4. Install the new pump by following the reverse procedure.

Tilting the washer for access (alternative)

1. Carefully lay the washer on its back panel (ask for help, it weighs 80-100 lbs).
2. The pump is visible in the lower center of the chassis.
3. Follow the same disconnection and installation procedure.

For top-loaders: be careful with the wire harness running along the chassis — don't yank the wires when tilting the washer.

Final test

After reinstalling the panels:

1. Turn on the water supply.
2. Plug in the washer.
3. Select the Spin Only cycle — do not add clothes.
4. Observe:

- Does the water drain normally without an error code?

- Are there any leaks at the hose connections?

- Does the pump make a normal draining sound (continuous hum for 1-2 minutes)?

1. If everything looks good: run a full cycle with a small load of laundry to confirm.

If there's a leak at the hoses: The clamp isn't positioned correctly. Unplug, adjust the clamp over the pump's retaining ring, and retest.

Repair specifications

When it's NOT the pump (other drain issues)

If the new pump is installed but the washer still won't drain:

Frequently asked questions

Q: How do I know if my Whirlpool washer's drain pump is bad?

A: It displays an F21 or F9 E1 code after cleaning the filter, doesn't drain at all, or a multimeter doesn't show continuity across the pump terminals (should read 5-10 ohms). If the pump makes no noise during the drain cycle, it's also faulty or there's a disconnected connector.

Q: How much does a Whirlpool washer drain pump cost?

A: Between $30 and $55 for an OEM part. The WP3363394 (top-load) is ~$30-40. The WPW10730972 (front-load) is ~$35-55. Compared to $150-250 just for a technician's labor, DIY saves significantly.

Q: Should I clean the pump filter before replacing the pump?

A: Yes, always. A clogged filter causes 60% of F21 errors. Clean the filter first and run a cycle. Only buy the pump if the problem persists.

Q: How long does it take to replace a drain pump?

A: 45-75 minutes the first time. The second time, less than 30 minutes. Panel access takes 10-15 min, draining water 10-15 min, the replacement itself 15-20 min, and the final test 10 min.

Q: My washer has standing water and won't drain. What should I do first?

A: Manually drain the water first. For front-loaders: use the emergency drain hose from the lower panel. For top-loaders: tilt the washer and disconnect the drain hose over a bucket. Then proceed with diagnosis.

Q: Does the drain pump have a fuse or thermal protection?

A: Some do. If it's not working but reads continuity, let it cool down for 30 minutes — it might be in thermal overload protection. If it still doesn't work, there's permanent motor damage.

Q: What objects commonly jam the drain pump?

A: Coins, buttons, hair clips, small socks, and buckles. Always check the impeller inside the compartment — a jammed object can block the pump without damaging it. Remove the object, and the pump might be functional again.

Related parts

• Drain pump WP3363394 — Whirlpool top-load washer
• Drain pump WPW10730972 — Whirlpool front-load washer
• Door latch WPW10619689 — front-load washer
• Whirlpool washer control board W10480186
• Whirlpool washer motor coupler WP285753A

Related articles

• Whirlpool washer won't drain — complete diagnosis
• Whirlpool error code chart
• How to reset a Whirlpool washer

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Written by Vinh Nguyen · Founder of RepairKitHub. Researches original part compatibility daily; verifies content with manufacturer documentation and DIY repair forums.

Last updated: 2026-05-08