So we have had this problem as well (error code 1cl1 & 1cl), where we get the error code in middle of the top washer. The problem is (in my opinion this is a horrible design flaw) there is a lint tray/filter in the top washer that is on the inside side wall of the spindel/drum that gets clogged (looks like a gray sqaure -- the manual says to clean it every 10 washes). If you don't clean that lint tray/filter, as the drum spins it won't expel water out it just keeps raising the water level until it overflows and spills into the fabric softener tray (if you take a look at your top fabric softener tray you may see it full of water) as well as over the top drum. That water than flows into the catch pan at the bottom of the washer which has a water sensor that stops the machine from operating because it thinks that the machine is overflowing with water. Unfortunately it doesn't detect which drum (top or bottom) is causing the issue so it put error messages on both top and bottom units.
To fix this issue, clean out the lint tray in the top unit and then tilt the unit forward so that all the water in the catch tray spills out, which clears out the sensor. Of course if you wait long enough, the water will evaporate from the catch tray and it will reset itself, but if you don't clean out that lint tray you will get into the issue again quickly.
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