Hard Shutdown (two back to back obstructions) LED blinking, Buzzer sounds for 5 minutes 936 control board February 14, 2020 22:46 Updated Clear any obstructions from the path of the gate. Press RESET to clear (or hard reset button). Related articles TroubleShooting basics: Hydraulic (STC controlled operators) How to locate serial numbers on Nice | HySecurity products Nice HySecurity Technical Support, what happens when you call us for help. How do I get my 816 extension tube back to factory position? No display 936 control board