Vacuum will not charge; display or app shows “Err 5” when placed on the dock or charger.

Safety first: Unplug the charger or dock from the wall before cleaning contacts. Do not use metal tools on live contacts.

• Check wall outlet: Plug another device (like a lamp) into the same outlet to confirm it has power.
• Inspect charger and cable: Look for frayed wires, bent pins, or burn marks on the iRobot charger or dock. Replace if damaged.
• Clean charging contacts: On both the vacuum and dock, gently wipe the metal contacts with a dry cloth. If there is oxidation, use a pencil eraser lightly, then wipe clean.
• Reseat the vacuum: Place the vacuum carefully on the dock, ensuring the contacts align and the unit sits flat. Watch for charging indicators (pulsing lights or battery icon).
• Try direct charging: If your model supports direct plug‑in charging, bypass the dock and connect the charger directly to the vacuum. If this works, the dock is likely faulty.
• Replace charger/dock: If Err 5 persists with a known‑good outlet and cleaned contacts, replace the iRobot charger or dock with an original part. If still unresolved, the internal charge circuit may require board‑level repair.