failure mode
Roomba i3 Error 7 — Wheel problem
Symptom: Robot beeps seven times / reports a wheel problem; may turn in place or refuse to move. Likely root causes: A drive wheel won't turn freely (debris or binding); Wheel motor/gear strained; Wheel dropped and lost traction repeatedly; Carpet too thick for the wheel to drive Next steps if owner-level checks fail: A wheel grinds, is silent, or won't drive under power — drive-module service; contact iRobot Customer Care 1-877-855-8593