Robot lawnmower displays E12 and shuts down unexpectedly during operation.

Safety first: Turn off the mower and allow it to cool in a shaded, ventilated area.

• Clean ventilation paths: Inspect the underside and sides of the Hyundai mower for cooling slots. Remove grass clippings and dust with a brush or low-pressure air.
• Reduce cutting load: Raise the cutting height one or two steps and mow more frequently so the mower is not forced to cut very tall or wet grass.
• Avoid peak heat: Adjust the mowing schedule so the mower runs in the early morning or evening rather than midday sun.
• Check blade sharpness: Dull blades increase motor load and heat. Replace with genuine Hyundai blades if they are nicked or blunt.
• Inspect internal fan (if equipped): Some models have a small fan on the main PCB or motor. Ensure it spins freely and is not obstructed.