Vacuum displays E7 or a specific LED pattern when the motorized brush or mini power head is attached, but works without it

Safety first: Remove the battery before inspecting electrical contacts.

• Inspect contacts: Look at the metal contacts on the main body, extension wand, and motorized head. Clean gently with a dry cloth. Ensure contacts are not bent or recessed.
• Test without wand: Attach the motorized head directly to the main body (if design allows). If it works, the extension tube wiring is likely damaged.
• Try another accessory: If another powered accessory (e.g., mini motorized brush) works fine, the original head is likely faulty and should be replaced.
• Check for third-party parts: Some non-Xiaomi heads may not be recognized correctly. Use original Xiaomi accessories designed for your model.
• Replace faulty component: If cleaning contacts does not help and only one accessory triggers the error, replace that accessory. If all powered accessories fail, the wand or main body contact board may need replacement.