Error 668, Roomba® Plus 400, Plus 500, Plus 600, Max 700, and Max 800 Series

Pad washing cannot start because there is no pad attached to the robot. There must be a pad attached to the robot in order for pad washing to begin.

1. If one or both pads are missing, please attach them.
   
   
2. If the pads are attached, please remove them, dry them off, and re-attach them.
   
   
3. If the error persists, please try using a different pad. Make sure you are only using authentic iRobot mop pads.

If the error persists after troubleshooting, please contact iRobot Customer Care for support.

For expedited service, please have the following ready: 

• Your robot charged and with you 
• Your robot's Serial number
• For warranty claims: Proof of purchase (receipt or invoice for purchase from an authorized retailer)