The following are two possible causes from the Levelegs troubleshooting guide. Hope this helps.
False RET (full retraction) Error Mode
a. For extensions greater than 20 seconds, if the retraction
time for any leveler is less than the extension time
(indicating premature clutching prior to full retraction), the
following occurs:
1. Warning alarm will sound.
2. Power is removed from the control box disabling
normal operations. (This is done to encourage operator
to do a visual inspection of levelers prior to further
leveling operations.)
3. The red and green LED?s for the particular leveler will
blink on and off to indicate the system is in an error
mode.
b. To proceed, the following is required:
1. Turn system on. This will shut the warning alarm off.
2. Visually inspect the leveler.
3. If it is required, activate levelers to correct problem.
Simultaneously press the EXTEND or RETRACT mode
switch along with the adjacent two (2) leveler switches
common to the lit LED?s. In error mode, any leveler can
be activated in this manner.
4. Complete an ALL RETRACT operation and system is now
out of error mode and ready for normal operations.
No Current Error Mode
a. During any operation if no current is detected from leveler
after leveler is activated, the following occurs:
1. Warning alarm will sound.
2. Power is removed from the control box disabling
normal operations.
3. The red and green LED?s for that leveler will blink on
and off to indicate the system is in an error mode.
b. To proceed, the following is required:
1. Turn system on. This will shut the warning alarm off.
2. Supply power to the leveler.
3. Complete an ALL RETRACT operation and system is now
out of error mode and ready for normal operations.
4. In the event retraction of the levelers is required
without rectifying the problem, individual levelers can
be retracted by simultaneously pressing the retract
mode switch along with the adjacent two (2) leveler
switches common to the leveler requiring retraction.