AL08
Kohler-SDMO Emergency Stop Circuit Active

The controller displays AL08 / Emergency Stop, and the generator cannot start in AUTO mode.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Emergency stop pushbutton engaged, open circuit in the emergency stop wiring loop, faulty emergency stop contact block, loose terminal in the control panel safety chain.

How to Fix / Troubleshooting

Safety first: Ensure the generator cannot start unexpectedly. Set the controller to OFF and disconnect the battery negative before opening the control panel.

  • Check E-stop button: Locate the red emergency stop pushbutton on the Kohler-SDMO canopy or control panel. Twist or pull to reset it if latched.
  • Inspect contacts: Open the E-stop enclosure and inspect the contact block. Verify continuity across the normally closed contacts when the button is released.
  • Trace safety loop: Using the wiring diagram, trace the emergency stop loop from the E-stop to the APM controller terminals. Tighten any loose screw terminals and repair broken wires.
  • Bypass test (for diagnosis only): Temporarily bridge the E-stop input at the controller to confirm the alarm clears. Remove the bypass immediately after testing and restore proper safety function.
  • Reset and test: Reconnect the battery, clear AL08, and test start in MANUAL then AUTO modes.

Never operate the generator with the emergency stop circuit bypassed; replace any defective E-stop components.

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Repair Difficulty

Medium 3/5

Required Part

Emergency Stop Pushbutton Assembly
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