NAC Blade Motor Overheating / Insulation Failure

Robot lawnmower emits a burning smell or shows signs of melted plastic near the blade motor area.

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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

Severely overloaded blade motor, Blocked ventilation around motor, Internal short in blade motor windings, Incorrect replacement blades causing overload

How to Fix / Troubleshooting

Safety first: Immediately turn OFF the mower, remove the battery, and move it to a non‑flammable surface. Do not continue operating until inspected.

  • Inspect for blockage: Check the cutting deck for heavy grass buildup or foreign objects that may have stalled the blade.
  • Check blades: Ensure only NAC‑approved blades of correct size and weight are installed.
  • Examine motor housing: Look for discoloration, melted plastic, or burnt wiring around the blade motor.
  • Replace motor: If there is any sign of overheating damage, replace the entire NAC blade motor assembly and inspect the main board for heat damage.

Warning: A burning smell indicates a serious fault. Do not attempt to cool the motor with water and do not reuse a burnt motor.

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Repair Difficulty

Hard 4/5

Required Part

Blade Motor Assembly
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