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

Greenworks Optimow

# Greenworks Optimow "Boundary wire broken (charging station blue LED flashing)": what it means and the fix

Steps **4**

Tools **None**

Parts None

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

Short answer Blue light. On the charging station, not the mower.
**What it means:** A flashing blue LED on the charging station means the boundary wire is broken or not connected, so the mower has no wire signal to follow.

**Quick fix:** Inspect the entire boundary wire, from the charging station and back.

## Fix it in 4 steps

- Inspect the entire boundary wire, from the charging station and back. Done?
- Inspect the guide wire, if you have one, from the charging station to where it splices into the boundary wire. Done?
- Check that all the couplings have been squeezed properly to make a connection. Done?
- Repair the break or reconnect the wire. Did it work?

**Fixed when:** The charging station LED turns solid green, which means the boundary wire and station are OK.

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

**Still showing Boundary wire broken (charging station blue 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

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

## Why it happens

- Boundary wire not connected to the station
- Break in the boundary wire, usually from accidental damage
- Coupling not squeezed properly

## Other Greenworks Optimow errors

[Red Error LED flashing ›](https://robotsforthat.com/fix/greenworks-optimow-red-error-light-flashing/)[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/)[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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[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

What does the flashing blue light on the Optimow charging station mean?

Greenworks says the boundary wire is broken or not connected. Walk the whole wire from the station and back, check the guide wire and squeeze every coupling, then repair the break.

## 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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