On my front loader I had to press and hold the control lock button until it beeped then the LOC light popped off
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=== Update (09/24/2016) ===
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I held down the "control Lock" button on my front loader until it beeped. A few seconds then the LOC error popped off. It happens a lot when I accidentally lean or touch the front of the machine which happens with almost no intent. Plays the on/off tune then powers on or off. This is a design flaw if you ask me.