Error code f21 sud

F22 is a low dram code. SUD means high suds. Most likely there's junk (coins, dirt, gunk, Bobby pins, etc.) Jammed in the sump.

This response gives a good description on how to clean it out.

https://www.ifixit.com/Answers/View/120564/Continuing+error+codes+Sud+and+F21+after+trouble+shooting

The SUD code is a result from oversudsing. BE SURE to use an HE detergent. The f21 code shows the machine is taking too long to drain as a result of too many suds. Start the washer with a cap full of fabric softener and nothing else. If it goes through the cycle as it should then you're good. If it doesn't, then replace the pump.

Push the pause/cancel button twice to clear your message. Then run through a rinse/spin cycle. Next try a normal load without any detergent. SUDS is usually from too much detergent. If this fails, checked the hose for kinks. Check connections and if all that fails, you will probably have to replace the pump. Good Luck!

An "F21" or "F02" error code is indicative of a slow draining cycle, normally caused by a clogged or kinked drain hose. If an "F21" or "F02" error code appears, check the drain hose on the back of your washer to ensure that it is not clogged or bent. Once the drain hose has been unblocked, the error code should disappear and the machine drain properly. However, if you have a high efficiency washing machine and the error code continues to appear, make sure you are using the correct detergent; because high efficiency machines use much less water than traditional washing machines, they require the use of a low sudsing detergent. Traditional detergents may produce too many suds, which can block the machine's drain hose and lead to slower draining cycles.

I have the manual for this machine. Under "Code 21" it says the following:
"F21" (Drain Problem) Select STOP twice to cancel the cycle. Unplug washer or disconnect power. Check the following: Is the drain hose kinked? Is the drain hose frozen? Is the drain hose clogged? Is the drain hose more than 96" (2.4 m) above the floor? Plug in washer or reconnect power. Re-select cycle and press START. If the problem remains, call for service.
For "SUDS" code, the following:
"SUD" (Suds Routine) When excessive suds are detected, a suds routine automatically starts. This routine removes extra suds and assures proper rinsing of your garments. "SUD" is displayed during rinsing to inform you that Suds Routine was activated. Use only HE (High Efficiency) detergents.
Here is some more information that may help you as well:
"F" Codes other than F20, F21 and F22 Select STOP twice to cancel the cycle. Select DRAIN & SPIN if there is excessive water in the washer. Re-select cycle and press START. If the problem remains, call for service.
I hope this is of some help to you, Please rate and comment, Thank You
Joe

I have the manual for this machine. Under "Code 21" it says the following:
"F21" (Drain Problem) Select STOP twice to cancel the cycle. Unplug washer or disconnect power. Check the following: Is the drain hose kinked? Is the drain hose frozen? Is the drain hose clogged? Is the drain hose more than 96" (2.4 m) above the floor? Plug in washer or reconnect power. Re-select cycle and press START. If the problem remains, call for service.
For "SUDS" code, the following:
"SUD" (Suds Routine) When excessive suds are detected, a suds routine automatically starts. This routine removes extra suds and assures proper rinsing of your garments. "SUD" is displayed during rinsing to inform you that Suds Routine was activated. Use only HE (High Efficiency) detergents.
Here is some more information that may help you as well:
"F" Codes other than F20, F21 and F22 Select STOP twice to cancel the cycle. Select DRAIN & SPIN if there is excessive water in the washer. Re-select cycle and press START. If the problem remains, call for service.
I hope this is of some help to you, Please rate and comment, Thank You
Joe

F21 error code is indicating that it is taking too long to drain water.

Your details indicate that you are using too much detergent or the wrong type of detergent and causing excessive suds. The drain pump can not pump suds out. The washer requires HE (High Efficiency) detergent formulated for front loading washers.

Cut back on the detergent and it will most likely operate correctly.

NOTES:
* After four (4) minutes the "Sd" error will be displayed, and then four (4) minutes later the "F21" error code will be displayed.
* Press STOP two (2) times to clear the display.

Possible Causes:
- Using too much High Efficiency (HE) detergent and causing too much suds.
- Using NON-HE detergent causing too much suds.
- Kink in drain hose
- Debris or foreign objects in drain pump filter.

The drain filter is located behind the lower access panel.

NOTE: Disconnect the power cord before removing the lower access panel and cleaning out the drain pump filter.

Remove the two screws (key#21) securing access panel. The filter cap (key#14) is removed by turning it counter clockwise. NOTE: Be sure that all the water has pump out before removing the cap. Have some large towels handy because there will be water coming out the filter/pump once you remove the cap. Check and clean the filter and remember to reduce the amount of detergent and the washer should perform as designed

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Hope helps (remember to rate and comment this free answer)..

Lets see what an F-21 is shall we? F21 Long drain Possible cause: Clogged filter, clogged/failed pump, suds detected by control.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

"F21" is a Long Drain error code. This indicates that you have an obstruction in the drainage system. More than likely you probably have a clog in the drain pump. The following link explains:

http://www.fixya.com/support/r1484065-f21_error_code_whirlpool_duet_kenmore

Included is a follow-on link that explains how to check the drain pump to clean. You may also have to remove the inlet hose that runs from the bottom of the wash tub to the inlet side of the drain pump. Debris can commonly clog in this area as well causing the drain cycle to fail.

If you have any questions about this repair, or need additional assistance, please let me know. I hope this helps you.

NOTE: If these preliminary measures do not correct your problem, you may have to replace the drain pump. It does not take much to damage the pump impeller or motor. Since the error code is generated if the drain cycle exceeds 8 minutes, if the pump is damaged and can't pump at the required volume, the error code will continue to appear until the pump is replaced.

NOTE: The "SUDS" error can commonly occur with the F21 error code as this is usually generated when air is sensed in the drainage system.

The "SUD" error is in direct relationship the other error code. "F21" is a Long Drain error. The following link explains:

http://www.fixya.com/support/r1484065-f21_error_code_whirlpool_duet_kenmore

If something is preventing water from pumping through the drain pump, you will often get a "SUD" error as air is developed in the pump. Make sure you double check all the drain lines as well.

If you have questions, or require additional assistance, please let me know before you rate the solution. I hope this helps you.