General Troubleshooting
| Symptom | Cause | Remedy |
| LEDs don’t turn on | Battery charge too low | Leave robot in sun or charge via USB port |
| Robot turns away from big weeds | Tall plants aren’t recognized as weeds | Remove tall weeds manually |
| Small weeds aren’t cut | Weeds too short to be sensed | Wait, weeds will be cut when they grow and trigger the sensor |
| Robot doesn’t cover the whole garden | Vegetation is too dense | Reposition leaves to give Tertill a clear path. Raise leaves so Tertill can run under leaves. |
| Robot doesn’t start automatically | 1) Extended cloudy period 2) Robot is in Hold mode | 1) Wait for sun or charge via USB 2) Press and release power button to enter patrol mode |
| Robot gets stuck | Garden contains a terrain trap | Eliminate ruts, holes, or rocks that can trap Tertill |
| Robot patrols but weeds are growing | 1) Whacker string too short 2) Garden is large | 1) Replace string 2) Use supplemental USB charging so robot runs longer |
| Robot won’t respond to button press or button hold | Transient event caused robot to enter hardware safe mode | Attach powered USB cable to return robot to a responsive mode |