Greenworks Optimow "PIN required (yellow Security LED flashing)": what it means and the fix

Steps2

ToolsNone

PartsNone

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

Short answerYellow light. The mower waits for PIN approval before it will run.

What it means: The yellow Security LED flashes when the mower needs PIN authorization through the mobile app. The green Operating LED stays off while it waits for the PIN.

Quick fix: Open the mobile app paired with the mower.

Fix it in 2 steps

Open the mobile app paired with the mower.
Authorize the mower with your PIN code.

Fixed when: The yellow LED goes off, which means no PIN is required.

Still showing PIN required (yellow Security 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 →

Parts that fix this

Replacement bladesFor Greenworks Optimow on AmazonCheck price →Check the part fits your model. Affiliate links: we may earn a commission at no cost to you.

Other Greenworks Optimow errors

Red Error LED flashing›Recovery mode (green Operating LED flashing)›Boundary wire broken (charging station blue LED flashing)›Charging station fault (red LED flashing)›Charging station LED off›All 6 Greenworks Optimow codes →

Keeps happening? Compare before you replace

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TerraMow V1000Camera only mower that maps itself, no RTK, for 0.3 acre lawns Check price on Amazon →

Mammotion YUKA mini 2 1000H$1,399 · LiDAR and camera mower with no RTK for lawns up to 1/4 acre Check price on Amazon →

Sources

Greenworks: Optimow 25H, 50H, 25 and 50 operator's manual, troubleshooting and indicator LEDs