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Error code reference

Whirlpool Washer Error Code F21

Excessive drain time; drain operation exceeds 8 minutes without reaching the pressure switch reset threshold

Whirlpool codesWhirlpool washer codes

Excessive drain time; drain operation exceeds 8 minutes without reaching the pressure switch reset threshold. Excess suds indicated by alternating 'SudS' display and countdown.

First step from the service manual

Clear the error code, disconnect power, verify drain hose is not forced into standpipe, check drain height does not exceed 2.4 m (8 ft), inspect drain hose for obstructions or kinks, inspect drain pump and remove foreign objects, check electrical connection between pump and CCU (DP2).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F21 means on a Whirlpool washer

The F21 error code on a Whirlpool washer indicates that the drain cycle has exceeded 8 minutes without the pressure switch resetting to its empty-tub threshold. The drain system on these machines relies on the pump evacuating water to a level where the pressure switch detects the tub is effectively empty. When that threshold is not reached within the 8-minute window, the control board (CCU) terminates the drain attempt and logs F21. In cases of excessive suds, the control board may alternate between displaying 'SudS' and a countdown timer as it waits for foam to dissipate before retrying the drain.

The components involved in this fault include the drain pump, the drain hose routing, the pressure switch, and the wiring harness connecting the pump to the CCU at connector DP2. A blocked or kinked drain hose is one of the most frequent physical causes, as it restricts flow regardless of pump function. Foreign objects such as coins, small garments, or debris lodged in the pump filter or impeller cavity are also common culprits, causing reduced or zero flow while the pump motor continues to run.

Drain hose installation height is a critical factor that is often overlooked. If the drain hose standpipe connection exceeds 2.4 meters (8 feet) in height, the pump may lack sufficient head pressure to clear water reliably, resulting in repeated F21 faults. Siphoning can also occur if the hose is inserted too far into the standpipe rather than simply resting in it. Electrical continuity between the pump and the CCU at the DP2 connector should be confirmed after ruling out all mechanical causes.

Source: manufacturer service documentation.

Common causes of F21

  1. 01

    Clogged drain pump or pump filter

    Wiring / connection

    Foreign objects such as coins, lint, or small garment items lodged in the pump impeller or filter cavity restrict water flow and prevent the pump from draining the tub within the 8-minute limit. Inspect and clear the pump housing and filter as a first mechanical step.

  2. 02

    Kinked or obstructed drain hose

    Wiring / connection

    A kinked, pinched, or partially blocked drain hose reduces flow enough to trigger F21 even if the pump is functioning correctly. Trace the hose from the pump to the standpipe and straighten or clear any restrictions.

  3. 03

    Improper drain hose installation

    Wiring / connection

    If the drain hose is forced too far into the standpipe, siphoning can occur and prevent proper draining. The standpipe connection height must not exceed 2.4 meters (8 feet) above the floor for adequate pump head pressure.

  4. 04

    Excess suds from detergent overuse

    Wiring / connection

    Using too much detergent or a non-HE detergent in an HE washer generates excessive foam that the pressure switch cannot distinguish from water, causing the control board to display 'SudS' and delay or abort the drain cycle.

  5. 05

    Failed drain pump or wiring fault

    Part replacement

    A drain pump that has failed mechanically or electrically will not move water regardless of hose routing. Check the electrical connection at the CCU connector DP2 for corrosion or loose terminals, and test the pump for continuity and proper operation before replacing it.

See the test procedure for each cause

Frequently asked questions about F21

What does F21 mean on a Whirlpool washer?
F21 means the washer attempted to drain for more than 8 minutes without the pressure switch detecting that the tub was empty. The control board stops the cycle and stores the fault code to alert you that the drain system needs attention. Common causes include a clogged pump, a blocked or improperly routed drain hose, or excessive suds. In some cases the display will alternate between 'SudS' and a countdown before showing F21.
Can I fix the F21 error myself without a technician?
Many F21 faults can be resolved without professional help. Start by disconnecting power, checking the drain hose for kinks, confirming it is not pushed too far into the standpipe, and cleaning out any debris from the drain pump filter and impeller. If those steps resolve the blockage and the code does not return, no service visit is needed. If the pump itself has failed or wiring at connector DP2 is damaged, a technician or confident DIYer with electrical testing experience would be needed.
Is it safe to keep using the washer when F21 appears?
You should not run additional wash cycles until the F21 fault is resolved. The washer has stopped mid-cycle because water is not draining properly, and running it again risks water remaining in the drum, potential motor strain, and water sitting in the machine long enough to cause odor or mildew. Address the drain restriction first, then clear the code before resuming normal use.
Will resetting the washer clear the F21 error code?
Clearing the error code by disconnecting power will remove the displayed fault, but it will not fix the underlying cause. If the drain hose, pump, or installation height issue is not corrected, the washer will trigger F21 again during the next drain cycle. Always diagnose and resolve the root cause before relying on a reset.
How much does it cost to repair a Whirlpool washer F21 error?
If the fault is caused by a clogged pump or hose obstruction, the repair cost is typically just your time since no parts are needed. If the drain pump has failed and requires replacement, parts and labor costs generally range from around $150 to $350 depending on your location and the service provider. Wiring harness repairs or CCU-related issues can vary further, so getting a diagnostic estimate from a technician before authorizing parts is advisable.

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