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Hi my name is Robert.....
On the control panel for the jacks it should have a name on it, need to know what it says. Also are the lights flashing at all? This might take some going back and forth...
I can find out and then I will take a look at the system and respond back, might take a few mins.... Robert
Have a feeling these might be aftermarket or installed after the unit was built, the manual mentions nothing about the leveling. I have done some installs on the class C units and normally we would put HWH jacks in but that is hard for me to say if that is what your unit has. IF you want to check or even better get me a picture of the control panel it should help, I am around daily and respond when I can..
Some basic things to check, make sure the RV is in park, the parking brake is set, if the are hydraulic make sure the level in the tank is all the way to the top with the jacks stored. Try running the jacks with the engine running and with the engine off. Beyond that I would need to know the manufacturer. IF they are HWH you will have a control box under the chassis with fuses in it, I would check that box for a blown fuse...... If needed please get back to me.... Robert