A few months ago I had words with ARB about these jacks, I never got any direct answers and all I got was what they wanted to talk about, I also had an Issue with a fridge, They kept me farting around doing tests for over 10 days then they wanted me to drive 400 miles to take the fridge back to the dealer so they could run the same tests that I had done, I went to ARB with a problem and they sent me a PDF of the user manual ?? In the end I worked out what the issue was, Although their fridges can work at an angle of 30* "JUST DON'T DO IT WITH IT TURNED OFF" because all the Gas/Fluid drains back towards the Compressor, And you should never do this with "ANY" Brand of Fridge, this was all because the delivery driver tipped it up to get it through a 3 foot 6 doorway,
Bottom line is I sent minute by minute details to ARB taking photos with times and temperatures along with doing their stupid tests and they did not have a clue what was wrong, I would return that Jack and buy a Hi-Lift, Yes they must be used with caution and respect but they are a cheap fix and easy to repair if you carry the kit with you for the cost of about 20 or 30 bucks, The ARB Jack is a One Trick Pony, The Hi-Lift has about 5 or 6 other uses.
Hope you get this resolved soon.