It's a system that is new to me so no real experience with it!
But there are often things which may be near the same and relate, so I might make a suggestion as an easy one to check before too much worry?
HWH is the old line system that many have used and there is a fairly common issue that may fit what you have.
It is a hydraulic system and that means it has a pump to build pressure and force fluid to the correct points when solenoids are opened or closed electrically.
One point that is easy to see is if those solenoids get a bit worn and a little fluid leaks past the seals on the solenoid. That oozing past can lets some of the fluid move.
Possibly the solenoids are actually letting the jacks creep slightly?
Can you see if the jacks have actually moved down when the light comes on?
That seems pretty odd for such a new RV, but just something to consider, while another point seems more likely!
On the HWH system, the alarm is not really sensing the jacks moving when the "jacks down" alarm comes on!
When the jacks extend, fluid from the tank is moved into the lines, so an easy way to sense the jacks being down is to put a float switch on the tank.
Simple thinking is that if the tank fluid is low, the jacks must be down! DUH?
What we often find is the jacks are still up but the fluid in the tank has gotten low!
This can sometimes be spotted if the alarm comes on when the RV moves on corners, etc. where the tank fluid level changes. If the alarm comes on when the RV is tilted, like on corners, but good when level, check the fluid!
Hydraulics, being under extreme high pressure makes oozing an almost constant question. Every time we extend the jacks they slide out all wet and slick but that film is lost, so eventually the tank level gets low and the alarm says the jacks are down!
Wild guess, but maybe check the manual for the correct way to measure the fluid and give it a check?
Sometimes it's the simple things that they don't tell us, that add up to vex us so bad!!
