I just checked out a Whirlpool Duet front load washer, and it won't fill, drain, nothing. It will lock the door, however. But then it won't unlock, and after hitting Cancel to stop the cycle and unlock the door, the 'Add Garment' light starts blinking. While the 'Add Garment' light is blinking, it will not respond to any buttons and the only way to get it out of that state is to unplug the machine and plug it back in. I couldn't find the tech sheet in the machine, so I couldn't run any sort of diagnostic test.
Any suggestions what to check, or how to access the diagnostic mode? Again, the model # is WFW8400TW02