I picked up an expensive iRobot Roomba i7+ Robot Vacuum with Automatic Dirt Disposal from the sidewalk. It has the dreaded ERROR 26, which seems to plague Roomba robots and typically requires purchasing a new cleaning head module. However, I found a way to fix it in 10 minutes without any cost.

The lubricant I use in the video is WD-40 White Silicon Grease. DO NOT TRY TO USE NORMAL WD-40.

Skip directly to the fix here: 03:00

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   / @gerrystech