E21
TerraMow
Chassis Shock / Impact Detected
Mower shows E21 and stops; often after hitting a solid obstacle.
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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
Severe collision with obstacle, Misaligned shock sensor, Damaged chassis frame, Faulty impact sensor board
How to Fix / Troubleshooting
Safety: Inspect the mower and area for hazards before restarting.
- Check for visible damage: Examine the TerraMow shell, wheels, and bumper for cracks or deformation.
- Remove obstacles: Clear rocks, branches, or garden fixtures from the mowing area.
- Reset sensor: Turn the mower OFF, wait 30 seconds, then ON. Some models clear the impact fault after a power cycle.
- Inspect impact sensor: If accessible, verify the shock sensor module is securely mounted and its wiring intact.
- Replace if needed: Install a new TerraMow impact sensor or repair the chassis if structural damage is found.
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Repair Difficulty
Medium
3/5
Required Part
TerraMow Impact Sensor Module
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