[Fix my robot](https://robotsforthat.com/fix/) / [Greenworks Optimow](https://robotsforthat.com/guides/greenworks-optimow-error-codes/) / Red Error LED flashing
● Checked Nov 12, 2026 From Greenworks support

Greenworks Optimow

# Greenworks Optimow "Red Error LED flashing": what it means and the fix

Steps **2**

Tools **None**

Parts None

Works for Greenworks Optimow 25H and 50H (also Optimow 25 and 50).

Short answer Red light. The mower has stopped and will not restart on its own.
**What it means:** The red Error LED on the mower flashes when the mower has stopped because of an error. Greenworks does not show number codes on the Optimow, so the light tells you that it stopped, not why.

**Quick fix:** Find and fix the cause of the stop at the mower.

## Fix it in 2 steps

- Find and fix the cause of the stop at the mower. Done?
- Press the Start button on the mower to restart it. Did it work?

**Fixed when:** The red LED goes off and the green Operating LED is solid again.

Great, it is fixed. Bookmark this page in case it comes back.

**Still showing Red Error LED flashing?**

The light keeps coming back after you fix the cause and restart. Call the Greenworks helpline at 1-855-345-3934 or contact your dealer, with your receipt and the product serial number ready. [Greenworks support →](https://www.greenworkstools.com/)

## Parts that fix this

[Replacement blades For Greenworks Optimow on Amazon Check price →](https://www.amazon.com/s?k=Greenworks%20Optimow%20replacement%20blades&tag=robotsforthatai-20) Check the part fits your model. Affiliate links: we may earn a commission at no cost to you.

## Other Greenworks Optimow errors

[Recovery mode (green Operating LED flashing) ›](https://robotsforthat.com/fix/greenworks-optimow-green-light-flashing-recovery-mode/)[PIN required (yellow Security LED flashing) ›](https://robotsforthat.com/fix/greenworks-optimow-yellow-light-flashing-pin/)[Boundary wire broken (charging station blue LED flashing) ›](https://robotsforthat.com/fix/greenworks-optimow-charging-station-blue-light-flashing/)[Charging station fault (red LED flashing) ›](https://robotsforthat.com/fix/greenworks-optimow-charging-station-red-light-flashing/)[Charging station LED off ›](https://robotsforthat.com/fix/greenworks-optimow-charging-station-light-off/)[All 6 Greenworks Optimow codes →](https://robotsforthat.com/guides/greenworks-optimow-error-codes/)

## Keeps happening? Compare before you replace

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[TerraMow V1000 Camera only mower that maps itself, no RTK, for 0.3 acre lawns](https://robotsforthat.com/robot/terramow-v1000/)[Check price on Amazon →](https://www.amazon.com/s?k=TerraMow+V1000)

[Mammotion YUKA mini 2 1000H $1,399 · LiDAR and camera mower with no RTK for lawns up to 1/4 acre](https://robotsforthat.com/robot/mammotion-yuka-mini-2-1000h/)[Check price on Amazon →](https://www.amazon.com/s?k=Mammotion+YUKA+mini+2+1000H)

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## Questions owners ask

Why is the red light flashing on my Greenworks Optimow?

Greenworks says a flashing red Error LED means the mower stopped because of an error. Check the cause, then press Start on the mower to restart it.

## Sources

- [Greenworks: Optimow 25H, 50H, 25 and 50 operator's manual, troubleshooting and indicator LEDs](https://www.greenworkstools.com/cdn/shop/files/optimow_om-v2.pdf)

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