Hello, my washer is flashing a code F 21 what does this mean?

The F21 error code indicates a long drain. Here are some tips that should help you resolve this problem:

Check your washer drain to make sure that it is draining properly.
Check the drain hose for kinks and clogs. Make sure that it is installed properly per the instructions in your owner's manual. An improperly installed drain hose can prevent the washer from draining properly.

Check for excessive suds in the washer tub. Excessive suds can prevent the washer from draining properly and will result in the F21 code. Make sure that you are using the proper amount of HE (High Efficiency) detergent to prevent excessive suds.

Place a shallow pan on the floor beside the washer and then pull the drain hose out and place the end of it in the shallow pan to see if the washer will gravity drain. If it does, then excessive suds or a drain pump problem could be causing this failure. If the water does not drain or drains extremely slowly, you could have a clog in the drain system of the washer.