Question about Danby Portable Air Conditioner
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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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