Kegel FLEX 17-5801 Operator's Manual page 160

The OLS LANE error is enabled when the machine begins its movement toward the lane. If
the machine takes more than 8 seconds to close the normally open contacts, it will display
the error. The machine could either be high-centered on the lane by a guide roller or the
speed is set too slow.
The OLS STUCK error is displayed when the OLS contacts are already closed due to a bad
switch or the wheel was rotated, causing it to close the switch. Someone could wire the
switch wrong as well.
The BUMPER error is displayed on the Walker when the bumper switch contacts close due to
a bad switch or running into something while the machine is moving.
This error will show when either bumper switch is receiving a signal. Make sure the machine
is not up against a foul cover creating a signal. If so, clear the machine and start over. If all is
clear, there is possibly a faulty switch causing the error message to appear.
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