Originally Posted by OlYeller
My thought is to remove power by disconnecting the battery and letting it reset. I don’t know which battery(ies) to disconnect, house or chassis. The engine has to be running to operate the levelers so I’m guessing it would be the chassis battery.
I don't know if that will work or not, but it can't hurt anything to try it. The levelers in the 29MV get their power from the house batteries. The controller also needs to get an "engine running" signal from the chassis ignition circuit. So it probably needs some power from both batteries.
Do you have the Lippert manual for the levelers? It has troubleshooting information. Here's what it says for that error: "Pressure switch did not sense retract pressure and pump timed out. Leaking hose or fitting." For what should be done it says: "Return levelers for service. Check for leaks, repair if necessary. Press enter and retract to clear error."