Robot mower shows E18 and stops with the blade disc free of grass; often after long use.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn OFF the mower, remove the battery, and wear gloves before touching the blade disc.
- Check for mechanical drag: Ensure the blade disc spins freely by hand. If stiff, see E3 for mechanical issues.
- Inspect motor connector: Open the housing and locate the blade motor connector. Unplug and inspect for corrosion or burnt pins, then reconnect.
- Check wiring continuity: Use a multimeter to test continuity of the Hall sensor wires from the motor to the PCB (refer to wiring colors in the service manual if available).
- Observe start behavior: If the motor starts briefly then stops with E18, the PCB may not be receiving RPM feedback.
When to replace: Replace the blade motor assembly if the Hall sensor is integrated and not serviceable separately. If a new motor does not fix E18, the main PCB motor driver circuit is likely faulty.
Repair Difficulty
Required Part
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