ego lm2135sp mower starts but then shuts off immediately with an orange flashing light, what's that mean?

Diagnosis

The orange flashing light on the EGO Power+ LM2135SP is the visual indicator for the "Overload Protection" circuit. This occurs when the motor controller detects a spike in amperage that exceeds the safe operating threshold of the brushless motor. Essentially, the mower is sensing an immense amount of physical resistance at the blade, which forces the motor to draw more current than the battery or the internal circuitry can safely provide, triggering an immediate emergency shutdown to prevent the motor windings from melting or the battery cells from overheating.

This is most commonly caused by "slugging," where the mower hits a thick patch of wet, matted grass or a hidden object (like a thick weed stalk or a piece of debris) that momentarily stalls the blade. You can confirm this is an overload issue if the mower starts normally, runs for a few seconds, and then cuts out the moment the blade engages the grass. If the light flashes even when the mower is running in an open area with no grass underneath, the issue is likely mechanical resistance in the blade spindle or a failing battery cell that cannot maintain the required voltage under load.

How to Fix It

To reset the system and clear the overload state, follow these precise steps to ensure no debris is causing the drag:

1. Immediately release the operator presence handle (the bail arm) to kill power to the motor.
2. Press the battery release button and slide the battery pack completely out of the mower. This performs a hard reset on the motor controller's logic board.
3. Tilt the mower onto its side or rear—CRITICAL: Always tilt the mower with the battery compartment facing UP to prevent battery acid leakage or electrical shorts.
4. Reach under the cutting deck and manually clear all accumulated grass clippings. Pay special attention to the area around the blade spindle and the discharge chute. Use a plastic scraper or a stiff brush; do not use metal tools that could nick the blade.
5. Inspect the blade for any wrapped strings, wires, or thick vines that may have wound around the shaft behind the blade. Cut these away with heavy-duty shears.
6. Check that the blade is not bent. A bent blade creates an imbalance that increases amperage draw and triggers the orange light.
7. Reinsert the battery until it clicks firmly into place.
8. Raise the cutting height to the maximum setting (Position 6) using the height adjustment levers to reduce the initial load on the motor.
9. Restart the mower and move it slowly through the grass to ensure the overload does not trigger again.

If That Didn't Work

• Check for Battery Degradation: If you are using an older EGO battery, it may have high internal resistance. Try a different, fully charged battery pack. If the mower runs fine with a newer battery, the original pack has degraded and can no longer provide the peak current required for the LM2135SP motor.
• Inspect the Drive Belt/Transmission: Since this is the SP (Self-Propelled) model, a jam in the drive transmission can sometimes cause electrical feedback or drag. Disengage the self-propel lever and see if the mower stays on. If it does, the issue is in the drive train, not the cutting blade.
• Verify Grass Moisture Levels: Wet grass is significantly heavier and more resistant than dry grass. If the grass is saturated, the motor will overload regardless of height. Wait until the dew has evaporated or the lawn has dried for at least 4 hours before attempting again.
• Test the Blade Spindle: With the battery removed, manually rotate the blade (wearing heavy gloves). It should spin smoothly. If you feel a "catch" or hear a grinding sound, the spindle bearings may have failed or a pebble is lodged in the motor housing, causing constant friction.

Heads Up

• Never tilt the mower with the battery facing down; this can damage the battery terminals and void your warranty.
• To avoid future overloads, mow in a "checkerboard" pattern or take smaller passes when tackling overgrown areas.
• Keep your blades sharp. A dull blade tears the grass rather than cutting it, which increases the load on the motor and makes the orange flashing light more likely to appear.
• Avoid using the mower in grass that is taller than 8 inches on the lowest setting; always start at the highest setting and lower it gradually over two separate passes.