Roborock S5Error 4Error 4 — cause and how to fix it
Error code: Error 4
Your Roborock S5's 'Error 4' indicates a cliff sensor malfunction, meaning it thinks it's about to fall off a ledge even when it's on flat ground.
How to fix S5 Error 4
- 1
This is often caused by dust accumulation on the sensors, which you should clean first.
- 2
If that doesn't work, one or more of the cliff sensor boards have likely failed, a common issue for S5s after a few years.
- 3
You'll need to open up the robot and replace the faulty sensor board.
- 4
Expect to pay about $10-20 for an aftermarket cliff sensor board.
What this repair uses
Roborock S5 cliff sensor board
Take it out, clean it, and seat it again before you replace it. If the error stays, this is the part to change.
Frequently asked questions
What does Roborock S5 Error 4 mean?
Your Roborock S5's 'Error 4' indicates a cliff sensor malfunction, meaning it thinks it's about to fall off a ledge even when it's on flat ground.
Is this a hard repair to do myself?
Most of the steps above take 20-40 minutes with basic tools like a screwdriver. If you'd rather not open the unit yourself, contact the official support line below instead.
What part do I need?
You'll need a Roborock S5 cliff sensor board. Compatible aftermarket parts are widely available on AliExpress and typically cost $8-60 depending on the part.
How do I contact Roborock support?
Roborock Korea official customer support. 1-year warranty. Phone: 1566-5534
Official support
Roborock Korea official customer support. 1-year warranty.
Online support
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