What Does Roborock Error 15 Mean and How Do I Fix a Dirty Wall Sensor?

Problem Description

Your Roborock is reporting Error 15, a dirty wall sensor. The wall-following sensor on the side of the robot is dusty or blocked, so it cannot track along walls correctly - a quick wipe usually clears it.

Why This Happens in Real Homes

Roborock Error 15 comes from the wall-following sensor - the small window on the side of the robot that lets it hug walls and clean edges. When dust, a smudge, or a strand of hair covers it, the robot cannot track the wall and stops. The fix is a quick wipe of that side window with a dry cloth and clearing anything lodged in its recess; never use liquid, which smears the window. Very dark or glossy walls can occasionally fool it too. Clean this sensor on the same schedule as your cliff sensors and Error 15 rarely returns; if it does with a clean sensor, that is a support case.

Symptoms

• The robot announces Error 15
• It says the wall sensor is dirty
• It no longer follows walls closely
• It bumps walls harder than usual
• Cleaning near edges is uneven
• The error keeps returning
• It misses the edges of rooms
• It errors soon after starting

Recognize these? Here's what usually causes it.

Common Causes

• Dust on the wall-following sensor window
• A smudge or film over the sensor
• Hair covering the side sensor
• Sensor blocked by residue after mopping
• A scratched sensor window
• The sensor is reading a dark or glossy wall
• Debris lodged in the sensor recess
• A sensor fault

Tools & Requirements

Step-by-Step Solution

1

Locate the wall sensor

The wall-following sensor is a small window on the side of the robot (usually the right-hand side), the side it hugs walls with. Error 15 is about this sensor, not the front bumper.

2

Wipe it clean

Use a soft, dry cloth to wipe the sensor window and clear any dust, film, or smudge. Dust build-up here is the top cause of Error 15.

Needed for this step

WHOOSH! Pro 16.9 fl oz Refillable TV Screen Cle...

This helps complete the fix you are currently reading.

$19.99

View Needed Item

3

Clear hair from the recess

Check the small recess around the sensor for hair or debris lodged over it, and pick it out so nothing blocks the sensor's view of the wall.

4

Keep liquids off the window

Do not use water or cleaner on the sensor. On mopping models, make sure splashed water or residue is dried off the side sensor.

Still stuck? Ask Trunetto about this exact issue.

Ask Trunetto

5

Restart the robot

Power the robot off and on, or restart from the app, after cleaning so it clears the Error 15 state and re-checks the sensor.

6

Rule out the wall surface

Very dark or high-gloss walls can occasionally confuse the wall sensor. If the error only happens along one such wall, that surface is the cause rather than dirt.

7

Clean it on a schedule

Add the side wall sensor to your regular maintenance wipe along with the cliff sensors, since dust collects on it faster than people expect.

8

Contact support if it persists

If the sensor is clean and dry but Error 15 continues, the sensor may be faulty. Contact Roborock with your model name and the error number.

Quick Solutions

Still having issues? This is usually the deeper cause below.

Need More Help? Roborock Support

Note: The contact information below connects you directly to Roborock's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.

How Does Roborock Compare?

Before replacing your Roborock device, see how it stacks up against alternatives in our full comparison guides.