3H/3P include height sensor fault detection, a safety feature that will alert the user if a height sensor is going out of useable range. A limit fault indicates that the sensor needs to be adjusted back into range, or that the sensor has moved from its original mounting location. The electronic sensor tool that is built into the display can be used to adjust the sensor(s) if you are getting this message. Follow these simple steps to verify the range with the electronic sensor tool:
Start with the vehicle at its lowest height. The sensor tool should display "Range Low" below each corner.
Manually air up the front corners of the vehicle to their maximum height. Both front corners should then display "OK."
Manually air up the rear corners to their maximum height. Both rear corners should then display "OK."
It may be necessary to repeat these steps by raising the rear first, to see if results vary. For any corners that do not display "OK," the sensors will need to be adjusted in order to be within the acceptable limits, or increase the overall range (stroke).