We own a Whirlpool front-load washer, Model WFW8300SW01 and Serial HLT4932808. About a month or two ago, the wash cycle would not complete with error code "F21" on the console. To get around this in the meantime, I manually set the dial to drain cycle and this would fix the problem, most of the time. I called around for a local Whirlpool technician and was told it would cost $81 to just come out and have a look. It might have to come down to this but I wasn't about to just hand over my money so I googled some fixes. The error code would also come up some times on drain cycle and am never sure which of the two troubleshooting techniques I applied really made a difference. The manuals say that error code "F21" could be caused by a kink in the drain tube or that the wall power was low on voltage. With this in mind, I tried the following: 1) unplugged the other power bar that shared the power circuit with my washer, and 2) drained water from the drain tube by remo...