Do you have full system air pressure (120 psi on the red and green needles)?
Do you have a "Dump" air switch that may be in dump position?
Do you have an Air Leveling system (like HWH) - if so, try pressing the Travel Mode button or hitting the HWH reset switch.
Lastly if the problem is electronics, shut off the coach, turn off the main battery discount, then wait a few minutes and turn everything back on ( a reboot).
Kick the tire.