Maytag washer — Error Code F21
The appliance is failing to empty the water from the drum within the expected timeframe.
What it means
The F21 error code on Maytag front-load or top-load washing machines signals a 'Long Drain' fault. The Central Control Unit (CCU) tracks water levels using an analog pressure sensor. If the machine fails to signal an empty drum within the programmed 8-minute window after the drain pump is triggered, the CCU stops the cycle, keeps the door locked if water remains, and displays F21. This safety logic prevents water damage and protects the pump motor. While usually caused by physical obstructions or a pump failure, it can occasionally stem from a blocked pressure hose or a failing CCU relay.
Likely Causes
- 1 Clogged Drain Filter / Coin TrapLint, coins, or other small items have lodged in the pump housing, blocking the impeller from pushing water through the drain hose.
- 2 Failed Drain PumpThe pump motor may have burnt-out windings or a sheared impeller shaft. You must test for 120VAC at the pump and confirm approximately 15 ohms of resistance.
- 3 Kinked or Blocked Drain HoseThe external corrugated hose may be pinched, or the home's plumbing standpipe could be obstructed, causing water to back up into the appliance.
- 4 Blocked Pressure Switch HoseSludge from detergents can clog the air dome or pressure hose, trapping air and preventing the pressure switch from resetting to 'empty' even when the water has drained.
- 5 Faulty Central Control Unit (CCU)Rarely, a relay on the main control board may burn out, preventing the board from delivering the necessary 120VAC to engage the drain pump.
How to clear / reset
To reset the F21 code, press the Pause/Cancel button twice. If the door is locked due to standing water, you must manually drain the tub by opening the drain filter (coin trap) at the base of the unit. Place towels or a shallow container underneath, carefully unscrew the cap, and drain the water. Once finished, unplug the washer for 5 minutes to perform a hard reset on the CCU. Be aware that this only clears the display; if the underlying blockage or pump issue persists, the F21 error will reappear during the next drain cycle.
Common replacement parts
When to call a pro
Contact a professional if clearing the coin trap or inspecting the drain hose doesn't resolve the F21 error. Testing for 120VAC from the CCU under load or checking motor windings requires a multimeter and technical experience. If the fault involves the control board or internal wiring, DIY repairs can lead to further electrical issues. A-Fix Service provides a $90 diagnostic fee—waived if you approve the repair—and includes a 1-year warranty on all parts and labor for residents across Washington and Oregon.
FAQs
How much does it cost to fix an F21 error?
For simple clogs, you only pay the $90 diagnostic fee. If the drain pump requires replacement, the typical cost for parts and labor ranges from $180 to $280.
Can I fix the F21 code myself?
Yes, if the issue is a simple drain filter blockage. You can access the lower panel and clean the coin trap yourself. If the pump has failed or the CCU is damaged, we recommend calling for professional service.
Will the F21 code clear itself once the water drains?
No, you must manually clear the code by pressing Pause/Cancel twice or disconnecting the power, even after you have removed the standing water.
How long does it take a tech to fix this?
Our technicians typically resolve a standard drain pump replacement or deep clog removal in about 30 to 45 minutes.
Will running the washer with an F21 code damage it?
The machine stops the cycle to prevent damage. However, repeatedly forcing a cycle while the pump is jammed can cause the pump motor to burn out or damage the relays on the CCU.
Need help with F21?
Our certified techs diagnose Maytag error codes daily. $90 diagnostic · 1-yr warranty.