LJ is describing one of the first things to check.
run the jacks down, disconnect the sensor at the top of the jack. using a vom meter, check continuity between the black and white wire on the sensor. it should be open. check the harness to the touch pad by jumping the wires on the harness plugin.
when you connect the black and white wire on the harness the red light on the touch panel should come on. if not, the touch pad is bad. this is not a common problem.
download a service manual for your system. go thru the diagnostics following the manual.
but before you go thru a lot of checks, try this.
when traveling be sure to let the system time itself out. do not turn it off. make a habit of turning the store function on when ever you drive off.
this is the only function that will work on the hwh leveling systems, without having the park brake set. this is for jacks only. not air leveling, or rooms.
when it times out, it goes to sleep, and wakes up whenever one or more jacks extend more than 1/2 inch. it then opens the solenoids and allow the cylinder or cylinders, to retract, all without having the alarm go off.
is this a new problem, or has the problem been there since you got the coach?
two things may cause the cylinder to extend.
one, is there a heat source near the line or the jack in question? if so, either relocate the line or insulate it. if the jack is near an exhaust, you may have to add a shield. when was the last time the system was repaired? was a hose relocated near a heat source?, or a heat shield left off.
the second is the cylinder it self. if the seals are defective, or the rod bent, the only solution is to have the cylinder rebuilt, which is the cheapest, or replace it, with a reman cylinder.
hwh or stuarts can help you with that.
if you allow the problem to persist, it will eventually short the hydraulic solenoid for that jack. i see that a lot. when you have to use a 2 x 4 more than once, its time to get the repair done. it will save you a LOT of money in the long run.
please call me if i can help. 1-602-549-3638
i do work for hwh. i do not sell parts, or solicit service work on this forum.
when you call, i can help with the location of a part, or service work, just not here on the forum. i dont generally do service work anyway. just too old for that.