Roborock Error 2 — Collision Sensor Fault (Fix Guide)

What Does This Error Mean?

Roborock Error 2 means the collision (bumper) sensor is stuck or not responding. The bumper is either physically jammed by debris, or the sensor is dirty. Cleaning around the bumper and tapping it firmly usually clears this error.

Affected Models

Roborock S5 Max
Roborock S6
Roborock S7
Roborock Q5
Roborock E5

Common Causes

Debris jammed in the bumper gap is holding the bumper in the compressed position
Bumper sensor (infrared or contact switch) is dirty
Robot bumped into something at high speed and the sensor shifted
Low temperatures have made the bumper plastic stiff

How to Fix It

Tap the front bumper firmly with your hand, all the way around its surface.

The bumper is spring-loaded and tapping it sharply dislodges any debris that is holding it in the compressed position.
Use a can of compressed air to blow debris out of the gap between the bumper and the main body.

Fine dust, pet hair, and carpet fibers accumulate in the bumper gap and act as tiny wedges. Compressed air clears them effectively.
Wipe the small sensor windows on the front face of the bumper (or on the robot body inside the bumper area) with a dry cloth.

Roborock uses small infrared sensors inside the bumper to detect contact. Dirty windows cause false 'bumper pressed' readings.
Move the robot to a large, open area and restart. If the error only occurred in a tight space (corridor, under a table), the environment may have triggered a genuine sensor reading.

Error 2 is sometimes triggered legitimately — the robot hit something and the sensor is correctly reporting a collision. Restarting in open space lets the robot clear the error and resume.
Check for a firmware update in the Roborock app. Bumper sensitivity issues are occasionally addressed in firmware updates.

Open the app > Devices > your robot > More > Software Update.

When to Call a Professional

If the bumper moves freely and is clean but Error 2 persists, the collision sensor itself may have failed. Contact Roborock support.

Frequently Asked Questions

How is Roborock Error 2 different from Roomba bumper errors?

They are very similar — both mean the front bumper sensor reports a stuck or pressed state. The diagnosis and fix are also the same: tap the bumper, clean the gap, check for debris. Roborock uses numbered error codes rather than audio beeps, making diagnosis slightly easier.

Will Error 2 damage my Roborock if I keep restarting it?

No, but the robot will not be able to clean properly while the error is active — it will stop shortly after starting. Fix the error first, then run a full cleaning session.