Greenworks Optimow error codes: what each warning light means and the fix
The Greenworks Optimow does not use number error codes. It shows faults with LEDs on the mower and on the charging station. Greenworks' manual lists 6 warning states with a fix for each, and all 6 are here.
Researched by Riley Hart · updated Nov 12, 2026 · How we research
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Greenworks Optimow mowers have no numeric error codes. A flashing red Error LED means the mower stopped with an error: fix the cause, then press Start on the mower. A flashing blue LED on the charging station means the boundary wire is broken or not connected. Flashing green is recovery mode, so leave the mower on the station for up to 5 hours. Flashing yellow means it needs PIN approval in the app. A flashing red LED on the station is an electronic fault that needs your dealer or Greenworks support.
| Light | What it means | Fix from Greenworks |
|---|---|---|
| Red Error LED flashing | The mower has stopped because of an error | Check the cause of the error, then restart by pressing the Start button on the mower |
| Green Operating LED flashing | The mower is in recovery mode | Place the mower in the charging station for up to 5 hours until the LED stops flashing. If it keeps flashing, restart it outside the station and try again |
| Yellow Security LED flashing | The mower needs PIN authorization in the app | Authorize the mower with its PIN in the mobile app |
| Charging station blue LED flashing | The boundary wire is broken or not connected | Check and repair the boundary wire. Inspect it from the station and back, check the guide wire to its splice, and check every coupling is squeezed tight |
| Charging station red LED flashing | Electronic fault in the charging station or power supply | Contact your dealer or Greenworks support; there is no at home fix |
| Charging station LED off | No power to the station, or the mower is in Energy Saving mode | Check the mains voltage. Off is also normal when the mower is in Energy Saving mode |
Light meanings and fixes from the troubleshooting section of Greenworks' Optimow 25H, 50H, 25 and 50 operator's manual, checked November 12, 2026. Steady lights such as solid green and solid blue are normal and are left out.
What to do next
If it keeps coming back, contact the maker support first, especially under warranty. Out of warranty, compare the repair quote with a new robot.
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How Optimow error lights work
The Optimow has four LEDs on the mower: green for operating, blue for connectivity, yellow for security and red for errors. The charging station has its own LED. Greenworks' manual does not list number codes, so the color and whether the light is flashing or steady is all you get on the unit.
Most steady lights are normal. Solid green on the mower means it is charging, docked, paused, mowing or searching. Solid blue means it is connected to the internet server. Solid green on the station means the boundary wire and station are OK. Flashing blue on the mower only means it is still connecting.
The general fix sequence
Use this order before you call Greenworks.
- Check the charging station LED first. Flashing blue means a wire problem, and off means no power.
- Fix what stopped the mower at the mower itself.
- Press the Start button on the mower to restart it.
- If the mower is in recovery mode, leave it on the station for up to 5 hours.
- If the light keeps coming back, call Greenworks at 1-855-345-3934 or contact your dealer with your receipt and serial number.
Finding a break in the boundary wire
Greenworks says breaks are usually caused by accidental physical damage. Walk the whole boundary wire from the charging station and back, then the guide wire from the station to where it splices into the boundary wire. Check that every coupling has been squeezed properly. When the station LED turns solid green, the loop is whole again.
Questions people ask
Does the Greenworks Optimow have error codes?
Not number codes. The Optimow uses LEDs on the mower and on the charging station. A flashing red Error LED on the mower means it stopped because of an error.
How do I reset my Optimow after an error?
Greenworks says to check the cause of the error, then restart the mower by pressing the Start button on the mower.
Why is my Optimow charging station flashing blue?
The boundary wire is broken or not connected. Inspect the whole wire and every coupling, then repair the break.