"F02" or "F20"? These are two separate error codes that can get confused, but have similar causes.
"F02" is a Long Drain error. This is usually an indication of an obstruction somewhere in the drainage system, or a failed drain pump. In most cases, the drain pump reservoir just needs to be cleaned out. The following link explains how:
http://www.fixya.com/support/r3574284-checking_the_drain_pump_on_a_front_loadeIf you check the drain pump reservoir and the problem still persists, you may have a pump with a damaged motor/impeller, or something lodged in one of the drain lines. In particular, the drain line that runs from the bottom of the wash tub to the inlet side of the pump.
"F20" is a "No Water Detect" error. This can also be related to a clogged or non-working drain pump, but can also be related to poor incoming water flow and some other component malfunctions. The following link explains:
http://www.fixya.com/support/r3608632-f20_error_code
NOTE: A "SUD" error code can also often occur in conjunction with other error codes. This is due to air being detected in the drainage system, which can occur if the pump is not running, or if you have an obstruction BEFORE the pump. You need to remove the inlet hose from the pump to ensure it is also not blocked. Correct your drainage system fault, and the SUD error (if displayed) should go away.
I recommend you check the drain pump, first, since it can be realted to BOTH errors. Remove the inlet hose, as well, and inspect for clogs. In is common for small garments to become lodged in this area and restrict water flow to the drain pump. Check the output drain line for obstructions as well.
It does not take much to damage these small drain pumps. The error code is generated if the drain cycle exceeds 8 minutes. So...if the impeller or motor become damaged, and the pump does not pull water at the correct volume, you may still experience the drain error. In this case, you will have to replace the pump in order to get the error to clear. The following link explains how:
http://www.fixya.com/support/r3574350-replacing_the_drain_pump_in_a_front_loadReplacements parts (if required) can be purchased at any of the following websites:
searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com
Prices vary between sites, so shop and compare. The first three sites listed also have helpful exploded view parts illustrations to assist you with locating and properly identifying the parts you may need.
NOTE:
For a full explanation of all the error codes, each one of these appliances come with a technical data sheet inside. To access, you will need to remove the lower toe panel under the door. The access screws are located under the bottom front edge of the panel. You may have to prop the two front fett of the washer up for better access ( a 2x4 works well for this). With the screws removed, the panel should drop down, then come off. If the tech sheet isn't directly behind the panel, it will be affixed to one of the interior cabinet walls. The tech sheet lists all error code definitions, troubleshooting data, diagnostics procedures and wiring diagrams. I mention the tech sheet because you may need it to troubleshoot this error code.Read through the information provided and let me know if you have any further questions. I hope you find this information helpful.
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