Error 18 — fan error on the iRobot Roomba i4

iRobot Roomba j5 Combo Filter iRobot Roomba j5 Combo Left side brush iRobot Roomba j5 Combo Right side brush iRobot j5 Combo Main Brush Roller iRobot Roomba j5 Combo Side brush set iRobot Roomba i3 Filter iRobot Roomba i3 Left side brush iRobot Roomba i3 Right side brush iRobot Roomba i3 Side brush set iRobot Roomba i3+ Filter iRobot Roomba i3+ Left side brush iRobot Roomba i3+ Right side brush iRobot Roomba i3+ Side brush set iRobot Roomba i4 Filter iRobot i3 Main Brush Roller iRobot i3+ Main Brush Roller iRobot Roomba i4 Left side brush iRobot Roomba i4 Right side brush iRobot Roomba i4 Brush guard iRobot Roomba i4 Side brush set iRobot Roomba i4 Cable organizer iRobot Roomba i4 Cleaning tool iRobot Roomba i4 Charging cable iRobot Roomba i4 Remote control iRobot Roomba i5 Filter iRobot Roomba i5 Left side brush iRobot Roomba i5 Right side brush iRobot Roomba i5 Side brush set iRobot Roomba i6+ Filter iRobot Roomba i6+ Left side brush iRobot Roomba i6+ Right side brush iRobot Roomba i6+ Side brush set iRobot Roomba 694 Filter iRobot i4 Floor Cleaning Solution iRobot i5 Main Brush Roller iRobot i6+ Main Brush Roller iRobot Roomba 694 Left side brush iRobot Roomba 694 Right side brush iRobot Roomba 694 Side brush set iRobot Roomba 675 Filter iRobot Roomba 675 Left side brush iRobot Roomba 675 Right side brush iRobot Roomba 675 Side brush set iRobot Roomba 614 Filter iRobot Roomba 614 Left side brush iRobot Roomba 614 Right side brush iRobot Roomba 614 Side brush set iRobot Roomba 692 Filter iRobot 675 Main Brush Roller iRobot 614 Main Brush Roller iRobot Roomba 692 Left side brush iRobot Roomba 692 Right side brush iRobot Roomba 692 Side brush set iRobot Roomba e5 Filter iRobot Roomba e5 Left side brush iRobot Roomba e5 Right side brush iRobot Roomba e5 Side brush set iRobot Roomba e6 Filter iRobot Roomba e6 Left side brush iRobot Roomba e6 Right side brush iRobot Roomba e6 Side brush set iRobot e5 Main Brush Roller iRobot e6 Main Brush Roller iRobot i4 Replacement Battery iRobot i4 HEPA Filter iRobot i4 Side Brush iRobot i4 Main Brush Roller iRobot i4 Mop Pad iRobot i4 Dust Bag iRobot i4 Water Tank Filter iRobot i4 Dock Filter iRobot 694 Main Brush Roller iRobot 692 Main Brush Roller