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Hi, thanks for using JustAnswer.com. F7 on this product is a fault code for a stuck membrane switch. How are you able to verify that this is NOT the failure? The control is detecting that a circuit from the membrane is closed, causing the error code. The membrane switch is likely to blame, but if you are certain it is OK, the control is the culprit. You might try unplugging the ribbon cable from the membrane switch where it plugs into the board and GENTLY cleaning it with a pencil eraser and see if it comes back to life with no fault code. Let me know how you do....