Robot vacuum will not start cleaning; emits error tone and shows E1 on display or app.

Safety first: Turn the robot OFF using the main power switch (if present) and remove it from the charging dock. Do not open the battery compartment if the pack is swollen or hot.

• Check basic power: Place the robot firmly on the Philips charging dock and verify the dock's LED is lit. Ensure the wall outlet has power by testing with another device.
• Allow extended charging: Leave the robot on the dock for at least 4–6 hours. Some Philips robot vacuums will show E1 when the battery is deeply discharged and may need a long pre-charge.
• Inspect battery contacts: Remove the robot from the dock and inspect the charging contacts on both the dock and robot. Clean them with a dry cloth or a cotton swab slightly dampened with isopropyl alcohol. Let them dry fully and try charging again.
• Check battery compartment: If your Philips model has a user-accessible battery door, remove the screws, open the compartment, and verify the battery pack connector is firmly seated on the main board. Do not pull on the wires; press the plastic connector body.
• Test with another outlet/dock: If available, try another compatible Philips charging dock to rule out a dock failure.
• Replace battery if needed: If the robot only shows E1 and never begins charging, the lithium-ion pack may be defective. Replace it with the exact Philips-compatible battery pack specified in your user manual.
• Stop if you smell burning or see swelling: If the battery is swollen, leaking, or very hot, do not attempt to charge it. Unplug the dock and contact a professional service center for safe disposal and replacement.