Hunter L401 - Page 28

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• 6. Troubleshooting L401 & L404 OPERATION INSTRUCTIONS
Troubleshooting (continued)
PROBLEM POSSIBLE CAUSE SOLUTION
One or more lock latches still
engaged on the lock ladder.
Raise lift more before pressing
“Latch Retract” button.
Air control malfunction. Check air supply and hoses.
Velocity fuse tripped. Contact factory service
representative.
“Lower” sequence started,
lift raises, does not lower.
Electrical/Hydraulic control
malfunction.
Contact factory service
representative.
Lift continues to descend
after “Lower” lever is
released.
2-way valve (“Lower” lever) stuck
open.
Operate “Lower” lever again. Contact
factory service representative.
“Latch Retract” button
released, indicator does
not black.
“Latch Retract” button stuck. Contact factory service
representative.