Ecovacs Bumper / Collision Sensor Error

Robot vacuum reports E4 and stops; may indicate bumper or collision sensor problems.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Bumper stuck in pressed position, Debris behind bumper, Bumper switch failure, Bumper cable disconnected

Safety first: Turn the robot OFF.

Check bumper movement: Press and release the bumper across its length to ensure free movement.
Clean gap: Use compressed air and a brush to clean the gap between bumper and body.

If E4 persists: The bumper switch board may need replacement.

Hard 4/5

Bumper Switch Board

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