You are describing typical failure modes of the Schwintek slide system. You can click on support at bottom of page at LCI1.com and download manuals. The eight blinks (shorted) indication quite often is the motor over torqueing, causing a high current situation. The controller senses current levels to operate. Best thing you can do is get a good tech to fix it for you. There are several things that can cause this type of issue. I'm factory trained on Schwintek systems and am also a (retired) electrical engineer like yourself . . . And the Schwintek systems annoy the heck out of me. I work on them frequently. If in Chicago area, bring it to my Dealership.
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