First, press the back up release on the back of the bar if the door does not release the there is a fault in the systems general wiring. Check the system wiring.Second, if the door does release when you press the back up release button check the sensitivity adjustment potentiometer on the back of the board turning the POT clockwise will increase the sensitivity and the bar may begin to function.Third, if the door does release when you press the back up release button and you have tried adjusting the sensitivity then you need to check the voltage for the bar at the six pin connector that connects the cable to the board. Checking between red and black with a meter you should see system voltage.Fourth, if the back up button works, you have tried adjusting the sensitivity and you have good voltage at the six pin connector check the antenna wire and make sure it is connected to the bar via the Phillips head mounting screw also check to make sure that the screw is not stripped. Meter between the face of the bar and the point were the antenna wire solders to the board you should see near zero resistance.If everything checks out contact the factory.
First, check for voltage at the lock if voltage is present and the door is not locked then the lock is the problem.Second, if you do not have voltage at the lock check the sensitivity adjustment potentiometer on the back of the board turning the POT counter-clockwise will decrease the sensitivity and the bar may begin to function.Third, if adjusting the sensitivity does not work try removing the red wire of the harness from positive DC if the door does not lock check for voltage between the white and black wire of the harness if you have no voltage then an upstream switch is more likely the problem.Fourth, check the surrounding area for anything that might generate an RF field such as neon signs or loss prevention gates disconnect the device and see if the bar begins working properly, if it does then the addition of a 22,000 micro Henry inductor in-line between the board and the bar should solve the problem. If this does not work and everything else checks out contact the factory.
This is almost always due to use of a switching power supply. Try running the bar off of a clean DC source such as a battery (minimum 12VDC ) if the bar begins working you can try to clean up the supply by adding 2ea. 0.01 micro Farad capacitors to the supply one between positive and earth ground and one between negative and earth ground. If this does not work contact the factory.