Maytag washer — Error Code F21
The washer is taking too long to drain water from the tub.
What it means
The F21 error code on a Maytag front-load or top-load washer indicates a 'Long Drain' condition. The Central Control Unit (CCU) monitors the water level via the analog pressure sensor. If the pressure switch does not register an empty tub within a specific timeframe (typically 8 minutes) after the drain pump is energized, the CCU aborts the cycle, locks the door if water is too high, and flashes F21. This is a protective measure to prevent flooding and pump motor burnout. The fault is almost always mechanical—such as a restriction in the drain path or a failed drain pump—though occasionally a clogged pressure hose or faulty CCU relay can falsely trigger the code.
Likely Causes
- 1 Clogged Drain Filter / Coin TrapDebris, coins, or lint blocking the pump housing, preventing the impeller from moving water into the drain hose.
- 2 Failed Drain PumpThe pump motor windings may be burnt out, or the impeller shaft is sheared. Requires testing for 120VAC at the pump and checking for ~15 ohms of resistance.
- 3 Kinked or Blocked Drain HoseA restriction in the external corrugated hose or a blockage in the home's plumbing standpipe backing up into the machine.
- 4 Blocked Pressure Switch HoseDetergent sludge in the air dome or pressure hose traps air, preventing the pressure switch from resetting to the 'empty' state even if the water is gone.
- 5 Faulty Central Control Unit (CCU)Rare, but a burnt relay on the main control board can fail to send the necessary 120VAC to energize the drain pump.
How to clear / reset
To temporarily clear the F21 code, press the Pause/Cancel button twice. If the door remains locked due to standing water, you will need to manually drain the tub by accessing the drain filter (coin trap) at the bottom front of the washer. Place a shallow pan or towels down, slowly unscrew the filter cap, and let the water drain. Once empty, unplug the washer for 5 minutes to hard-reset the CCU. Note: Clearing the code will not fix the underlying issue; F21 will return on the next drain/spin cycle if the blockage or pump failure isn't resolved.
Common replacement parts
When to call a pro
Call a professional if clearing the coin trap and checking the drain hose doesn't resolve the F21 code. Diagnosing a failed drain pump requires a multimeter to check for 120VAC from the CCU under load, and testing motor windings for continuity. If the issue lies in the control board or internal wiring harness, DIY repairs can risk further electrical damage. Axis Appliance Repair offers a $90 diagnostic (waived if you proceed with the repair) and backs all work with a 1-year parts and labor warranty.
FAQs
How much does it cost to fix an F21 error?
If it is just a clog, you only pay the $90 diagnostic. If the drain pump needs replacement, total repair costs typically range from $180 to $280 including parts and labor.
Can I fix the F21 code myself?
Yes, if the cause is a clogged drain filter. Access the lower front panel, unscrew the coin trap, and clean out any debris. If the pump is dead or the CCU is failing, professional service is recommended.
Will the F21 code clear itself once the water drains?
No, the code must be manually cleared by pressing Pause/Cancel twice or unplugging the machine, even after the water is manually removed.
How long does it take a tech to fix this?
A standard drain pump replacement or deep clog removal takes our technicians about 30 to 45 minutes to complete.
Will running the washer with an F21 code damage it?
The washer will halt the cycle to protect itself. However, repeatedly trying to force a cycle with a jammed pump can burn out the pump motor or damage the CCU relays.
Need help with F21?
Our certified techs diagnose Maytag error codes daily. $90 diagnostic · 1-yr warranty.