Kenmore Washer Not Draining — F21, 5d, Sud Error Code Fix

Common Symptoms

• F21 error code — 'Long Drain' fault — washer stops mid-cycle
• Sud or 5d error code — excess suds detected, cycle paused
• Standing water in the drum after wash or rinse cycle
• Clothes are soaking wet after the spin cycle completes
• Washer makes a humming noise during drain but water level doesn't drop
• Front-load Kenmore: door won't unlock at end of cycle
• Top-load Kenmore: agitates but won't spin or drain

Most Likely Causes

1. 1

   F21 — Clogged Drain Pump Filter (front-load models, most common)

   On Kenmore front-load washers (110.xxxxx series), the drain pump filter — accessible behind the small kick panel at the lower front of the machine — catches coins, lint, hair ties, and small socks. A partially blocked filter slows drain time enough to trigger F21. This filter is free to clean, takes 10 minutes, and solves F21 in the majority of cases. Kenmore recommends cleaning it every 30–50 wash cycles.

2. 2

   Sud / 5d — Excess Suds (front-load and top-load HE models)

   Sud or 5d fires when foam density is too high for the machine to drain and spin effectively. The control board detects suds via the pressure sensor — foam compresses the air column differently than water. The washer pauses and runs an extended rinse to dissipate suds before proceeding. Root cause is almost always too much detergent, non-HE detergent in an HE machine, or detergent dispenser drawer buildup. Using 1–2 tablespoons of HE detergent per load (not the full cap) eliminates Sud in nearly all cases.

3. 3

   Kinked or Improperly Routed Drain Hose

   The drain hose must be routed with a high loop to the standpipe (minimum 30 inches from the floor, maximum 96 inches). Too low creates a siphon that continuously drains the tub during the wash. Too deep in the standpipe (more than 4–6 inches) causes back-pressure. A hose kinked behind the machine — usually when the washer is pushed tight against the wall — is another frequent cause of F21 on otherwise well-maintained machines.

4. 4

   Pump Impeller Jammed with Debris

   Even with the filter clean, a sock, coin, or underwire wire can bypass the filter and jam the pump impeller. Symptom: the pump motor hums during the drain cycle but no water moves. On front-loaders, the impeller is accessible after removing the filter cap — shine a flashlight into the housing and try rotating the impeller with a finger. It should turn freely. On top-loaders, accessing the pump requires removing the lower front panel.

5. 5

   Lid Lock Failure — Top-Load Kenmore (110 series)

   Kenmore top-load washers require the lid lock to confirm engaged before entering spin and drain. A failed lid lock solenoid, switch, or latch prevents drain and spin entirely, even when the pump and hose are in perfect condition. The lid lock assembly is at the rear of the lid opening and is testable with a multimeter. Models affected: Kenmore 110.29xxx, 110.2892xxx, and similar MVW-platform top-loaders.

6. 6

   Failed Drain Pump Motor

   If the filter is clean, hose is clear, and impeller rotates freely but the machine still won't drain, the pump motor winding may have failed. On Whirlpool-platform Kenmore front-loaders, disconnect the pump wiring harness and measure resistance across the motor terminals — should read 5–20 ohms. An open circuit (OL) or dead short (0 ohms) means the pump needs replacement.

Quick DIY Checks

1. 1Identify your model platform: check the first three digits of the model number label (inside the door or on the back panel). 110.xxxxx = Whirlpool-platform (F21 code). 796.xxxxx = LG-platform (OE code). This tells you which parts to order. The drain pump is not interchangeable between platforms.
2. 2Front-load Kenmore pump filter access: place old towels and a shallow pan under the lower front access panel. On Kenmore front-loaders, the panel is at the bottom right or bottom left — it pops off or has a coin-slot screw. Behind it: a small 3-inch drain hose with a plug (drain this first — several gallons may be trapped), and the large round filter cap. Unscrew the cap counter-clockwise and pull out the filter. Remove all debris, rinse the filter under running water, and inspect the housing with a flashlight. Check for debris in the pump inlet (the opening behind the filter seat) and try rotating the impeller with a finger.
3. 3Top-load lid lock test: on Kenmore top-loaders, the lid lock assembly sits under the lid ring at the rear. Unplug the machine, locate the wiring harness connector for the lid lock, and disconnect it. Test the solenoid coil with a multimeter in resistance mode — should read approximately 150–200 ohms, not OL. Manually actuate the lock plunger and test switch continuity — the contacts should close when the plunger is depressed. Replace the lid lock assembly if the solenoid reads OL or the switch doesn't close.

1. 4Drain hose inspection: pull the washer away from the wall and trace the drain hose from the pump outlet to the standpipe or laundry sink. Confirm: no kinks, no crushing against the wall, hose end inserted only 4–6 inches into standpipe, and standpipe height is 30–96 inches from the floor. Pour a bucket of water directly into the standpipe to verify it drains freely (a clogged standpipe is a plumbing issue, not a washer issue).
2. 5For Sud / 5d: let the washer complete its extended rinse cycle — do not interrupt it. After completion, run a Rinse & Spin cycle with zero detergent to flush the drum. Going forward, switch to an HE detergent and use no more than 1–2 tablespoons per load. Clean the detergent dispenser drawer by removing it (it usually pulls straight out) and rinsing it under hot water to remove surfactant buildup.
3. 6Run a Drain & Spin test cycle after each repair step: after cleaning the filter and verifying the hose, run a Drain & Spin only cycle without laundry. Watch for: pump motor sound within 10 seconds, water level dropping within 30 seconds, and spin starting after the drum is empty. A passing Drain & Spin with no error code confirms the repair.

Repair vs Replace

Recommended Tools & Parts

• Kenmore / Whirlpool Drain Pump Assembly

  Replacement drain pump motor and housing for Kenmore 110.xxxxx front-load washers (Whirlpool platform). Fixes F21 long drain errors when the filter is clean and the hose is clear. Includes motor and impeller housing as a unit. Verify compatibility with your full model number before ordering.

  $40–$80

  Buy on Amazon →

• Kenmore Top-Load Washer Lid Lock Assembly

  Replacement lid lock assembly for Kenmore top-load washers (110-series Whirlpool platform). Fixes lid lock failures that prevent spin and drain. Includes lock motor, solenoid, and position switch. Models: 110.29xxx, 110.2892xxx, and related Kenmore/Whirlpool top-loaders.

  $25–$55

  Buy on Amazon →

• Kenmore Washer Drain Hose (Universal)

  Replacement drain hose for Kenmore washers. Required if the existing hose is kinked, cracked, or shortened from previous repairs. Universal hoses fit most Kenmore front-load and top-load models — verify inner diameter matches your existing hose before ordering.

  $10–$25

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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