I have a whirlpool duet steam washing machine, model number WFW9500TW01 that I bought last summer second hand after it was refurbished. It ran good for a while, and then started throwing the F20 code. Originally, I was able to clear the code by unplugging the machine for a few minutes and then it would work fine. In November it started popping up everytime I would try to run the machine. It would run for about 5 or so minutes and then produce the F20 code. I first replaced the water inlet flow meter (part # AP6015043), and that didn't help, so at the advice of some other forums I replaced the water level switch (part # AP6021127) and that made it work for a while. Went away for about a week for Christmas, came back only to the same problem only now it runs for about 20 minutes and shuts off throwing the same F20 code. I don't know what I should try next and I really need to get this machine back up and running. Any help, suggestions or advice before I go spend more money on another washing machine would be great. Thanks in advance