failure mode
Roomba i6 Charging Error 6 / 7 — Battery temperature
Symptom: Robot reports charging error 6 (too hot) or 7 (too hot/cold) and pauses charging. Likely root causes: Battery is above or below its safe charging temperature; Charging near a heat source (vent, radiator, sun); Robot just finished a long clean and the pack is warm; Very cold room / garage Next steps if owner-level checks fail: Error 6/7 appears at normal room temperature with no heat source — the battery's thermal sensor or the pack may be failing; replace the battery; if it persists, contact iRobot Customer Care 1-877-855-8593