[jsb5717]

Hard to say. You're maybe doing nothing wrong. Are they electronic or hydraulic? Mine are electric and will give me an error for out of stroke (my fault) or may just overload and turn off when I have to life the front a little higher than normal. They aren't out of stroke but seem to strain and struggle and eventually will fault and need to be rehomed. The fault will usually be for one specific jack even though there's no particular reason that it should have occurred.

Sometimes they will error out when the voltage is too low. According to Lippert they can error out when the voltage is too high (on shore power)...go figure. I was told the best scenario is healthy batteries, fully charged and holding above 12v, not connected to shore power. For me they will still error out when I have to high lift the front...