C20
Dreame
Side Wall Distance Sensor Fault
Robot vacuum reports C20; time-of-flight or wall sensor error.
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Safety Warning
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.
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Possible Causes
Dust on side IR sensor window, Sensor knocked out of alignment, Loose sensor cable, Faulty side wall sensor board
How to Fix / Troubleshooting
Safety: Turn off the robot before cleaning sensors.
- Locate side sensor: Find the small IR window on the side of the robot used for wall following.
- Clean sensor window: Wipe gently with a soft, dry cloth to remove dust and smudges.
- Check for damage: Inspect the plastic window and surrounding housing for cracks or impact damage.
- Test along a wall: Power on the robot and run a cleaning cycle along a straight wall to see if it can follow the edge without error.
- Internal inspection (advanced): Open the housing and verify that the side wall sensor board is firmly mounted and its cable is secure.
- Replacement: Replace the side wall IR sensor module if it remains unresponsive.
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Repair Difficulty
Medium
3/5
Required Part
Side Wall IR Sensor Module
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