OldTurkey03 is correct: In my case the machine kept throwing F02 code (drain pump continuously pumping) even after thoroughly cleaning out drain plumbing and filter completely. Removed pressure tube connector from back of tub housing (must remove rear cover for access) to discover it was completely fouled/blocked. This caused pressure switch to "think" there was still water in tub to be drained, even when empty. Cleaned pressure tube connector, reassembled, and now machine operates normally again.