Generator fails to start; controller shows AL09 indicating emergency stop active.

Safety first: Confirm that no real emergency condition exists before resetting any emergency stop devices.

• Check emergency stop button: Locate the red mushroom E-stop on the SDMO generator or remote panel. Twist or pull to reset it. Verify that the button latches in the released position.
• Inspect E-stop contacts: Open the E-stop enclosure and check the contact block for damage or loose wires. Replace the switch if contacts are burnt or mechanically faulty.
• Trace safety loop wiring: Follow the emergency stop circuit through the SDMO control panel terminals. Look for broken wires, loose screws, or corrosion at terminal blocks.
• Test continuity: With power off, measure continuity across the E-stop loop. It should be closed when all safety devices are reset. Repair any open circuits.
• Clear AL09: After restoring the safety loop, reset the alarm on the controller and test a manual start.