dewald leveling system

[Sandrofelisio]

Hallo you all.
I'm italian and i have a Dewald manual system touchpad #140-1179 on my RV Gulfstream.

I try now to explain the problem:
When I park (park brake ON and shifter in P) the panel is dark (OFF)
If I press the ON nothing happens, so I switch off the ignition and place the key on RUN and the "ON light" on the panel blinks.
If i press the ON button on the panel it stops blinking (return in OFF all dark) and there is no way to have the light on. I press ON many times but nothing.
I tried to keep ON pressed for 5 then 10 then 15 seconds but nothing.
All buttons are deactivated, I can press all I want but nothing.
To have the panel ON and to wake up the system th only solution I find is to press FRONT and REAR together (keep them pressed) and the rear right RR 3 times fast then release all.
With this method the ON led starts blinking and if I press it becomes SOLID led.
Then i can start with leveling procedure and it works perfectly.

Sometimes I have to repeat the "multiple button procedure" a lot of tim because sometimes nothing happens.
The seller says it's normal... but I think that something has to reprogrammed or similar because in the past it worked differently:
All black
press ON (solid ON Led)
levelling
Press Ret ALL all jacks up.
This was the normal way...

Please help me, I write to dewald support but no answers from them...

There is a FULL RESET PROGRAM?
There is a CALIBRATION PROGRAM?

HELP!!!!!!

The only change I did this year is that I've changed the battery (the engine battery) with another exactly the same.
It is full charged of course...

Sandro


Please help me to understand this problem and give to me a solution!!
Thanks a lot.

Sandro