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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The error code F21 indicates that the control is getting a message from the pressure switch that there is too much water in the tub. This can be caused by a faulty signal from the pressure switch or too much water being in the tub. Most often times, this is caused by poor drain pressure from the drain pump. The drain pump has a filter that is designed to catch any debris before it gets into the pump impeller. This filter is likely obstructed and will need to be cleaned out. At the bottom of the front panel are three screws. Once removed, you will have access to the drain pump assembly. It is in the center of the machine, directly behind the front panel. The filter will simply unscrew to allow access for cleaning. Have towels on hand, the water will come out once you remove that filter! Clean the filter out and run a rinse cycle to verify proper operation.
The pump filter is shown as number 11 in the diagram at the link below.
The video at the link below shows how to access the pump. You won't need to remove the pump, just turn the filter out for cleaning.
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