failure mode
Roomba i7 Charging Error 2 / 3 — Comms / charge circuit
Symptom: Robot reports charging error 2 or 3 and will not charge normally. Likely root causes: Battery communication fault (error 2) — needs reset or new pack; Robot's internal charging system not working (error 3); Counterfeit / incompatible battery; Repeated faults logged in the robot Next steps if owner-level checks fail: Charging Error 3 that persists with a known-good genuine battery — the robot's charging circuit is faulty and the robot may need service/replacement; contact iRobot Customer Care 1-877-855-8593