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So you are exactly right about the error. F21 means that the washer isn't draining well anymore and usually the filter just needs to be cleaned out. To access the drain catch, tip the machine backwards and lean it against the wall at a 45 degree angle or so. Remove the 3 screws along the bottom of the lower front panel. The screws should be 1/4" hex nut screws which can be removed with a socket or a nut driver. The lower front panel will then pull down and off. There is a 3" diameter plastic twist cap directly under the tub mounted to the floor. This is your drain cap. Unscrew the cap and clear any debris inside the drain catch. If you find nothing and the drain hose is clear, replace your drain pump.
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