Lippert Components Ground Control 2.0 Master Owner's Manual page 104

Problem
Jacks will not extend to ground,
pump is running.
Any one or two jacks will not retract.
Rev:11.08.19
Probable Cause
Little or no fluid in reservoir.
Leg valve is inoperative.
Electronic signal is lost between
switch and leg valves.
Hose damaged or not connected.
Return valve is inoperative.
Electronic signal is lost between
switch and solenoid.
Electronic signal is lost between
switch and leg valve.
Page 104
Corrective Action
Fill reservoir with Dexron III ATF.
Clean, repair or replace.
Trace wires for voltage drop or loss
of signal. Repair or replace necessary
wires or replace switch.
Replace with new hose or reconnect.
Replace inoperative return valve.
Attempt to retract jacks in manual
mode, if successful replace control
pad; if not, test voltage drop.
Repair bad wiring or replace
defective board or valve.
CCD-0001573-08