What make/model system do you have.
Most systems use solenoid valves to raise or lower the jack so it could be a bad valve
But you should also check the emergency release, this it the T handle on top of the valve. If the emergency release was left open the jack won't move. Unscrew it and then screw it all the way down.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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