Check drain hose first.
If you do not find any blockage, then you will need to access the pump, remove pump hose and look for blockage in there.
If there is no blockage at all, then either the water level switch, a faulty pump, a wiring problem, or a faulty timer board can be cause the machine not draining.
the Fl code indicates an overfill condition. If the washer is empty, then you likely have a problem with the water level pressure switch. If the washer is full of water and will not drain, you likely have a problem with the drain pump or the washer drain line.
If the washer is full of water, make sure that the washer drain is clear and working properly. Check the drain hose for kinks or clogs. If you find no problems with these issues, I recommend that you manually drain the washer using a wet/dry shop vacuum. Check the drain pump and connecting hoses for problems. You may need to replace the drain pump of water will drain out of the washer properly but the pump will not work properly. A clog in the check ball assembly at the bottom of the tub can also prevent the washer from draining properly.
Fl code indicates an overfill condition. If the washer is empty, then you likely have a problem with the water level pressure switch. If the washer is full of water and will not drain, you likely have a problem with the drain pump or the washer drain line.
If the washer is full of water, make sure that the washer drain is clear and working properly. Check the drain hose for kinks or clogs. If you find no problems with these issues, I recommend that you manually drain the washer using a wet/dry shop vacuum. Check the drain pump and connecting hoses for problems. You may need to replace the drain pump of water will drain out of the washer properly but the pump will not work properly. A clog in the check ball assembly at the bottom of the tub can also prevent the washer from draining properly.
You did not mention whether the washer actually pumps the water out of the washer when you are getting the F21 code. If the washer pumps the water out okay, then the pump and drain system are okay.
Excessive suds can prevent the pump from evacuating the water properly and will sometimes result in an F21. When the suds dissipate, the washer will then be able to pump out the water. Look for this type of condition if necessary.
If the drain pump runs but the washer will not drain the water, see if the washer will gravity drain. Pull the drain hose out of the stand pipe or sink and place it in a shallow pan at floor level. If the washer will gravity drain okay but will not drain when the drain pump is running then you will likely need to replace the drain pump.
If the washer will not gravity drain, then you still have a clog somewhere in the drain system. If you have not pulled the hose between the tub and the pump, then you could have a clog in this area.
If the washer does drain normally, then you could have a failed pressure switch, air pressure hose problem, wiring failure or a failed control board.
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