- Robot vacuums
- Robot vacuum
Error 21
eufy Error 21 on RoboVac: charging base blocked
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
RoboVac says Error 21: the charging base is blocked by surrounding obstacles. Clear anything around the base, check that its power indicator is lit and ask the robot to return to the base again.
Safety first
Stop and check this first
- Do not open the charging base or its adapter: they connect to the mains. Clean the pins only with a clean dry cloth, as eufy advises.
Safe checks you can perform
- Clear the area around the base
- Check power and contacts
- Try a guided return to the base
Leave these tasks to a qualified professional
- Do not attempt this professional task: Error 21 review by eufy support
- Do not attempt this professional task: Base diagnosis by authorized service
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Error 21 review by eufy support
What they doeufy support reviews the case when Error 21 persists with the base clear, powered and with clean contacts.
They must show youthe case number and their diagnosis.
In writingwhether the repair or a base replacement is under warranty.
Base diagnosis by authorized service
What they doeufy's authorized service checks the charging base and its adapter with suitable equipment.
They must show youthe fault found in the base or adapter.
In writingwhether the base or adapter is replaced and its reference.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Clear the area around the base
- Who:
- you.
- How:
- remove the obstacles around the charging base and try again, as eufy says.
- Result that matters:
- whether the robot returns to the base without repeating Error 21.
- If it returns:
- the obstacles were the cause.
- If it does not with the area clear:
- check the base's power.
- Evidence to keep:
- photos of the base area before and after.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
Check power and contacts
- Who:
- you.
- How:
- confirm the power indicator on the charging base is lit and wipe the pins on the base and on the bottom of the robot with a clean dry cloth, steps eufy gives for charging alerts.
- Result that matters:
- that the base has power and the contacts are clean.
- If the indicator was off or the contacts dirty:
- fix it and test again.
- If all was fine:
- try a guided return.
- Evidence to keep:
- a photo of the lit indicator.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
Try a guided return to the base
- Who:
- you.
- How:
- place the robot in front of and facing the base within 6 feet (about 1.8 m), press the home button and let it dock on its own, as eufy describes.
- Result that matters:
- whether the robot docks by itself.
- If it docks:
- the base works and the surroundings were the problem.
- If it does not dock with the area clear:
- contact eufy support.
- Evidence to keep:
- a short video of the docking attempt.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Robot vacuums
- Brand
- eufy
- Product type
- Robot vacuum
Known code variants
- 21
- Bafang 21
- Bafang DP C241 error 21
- Bafang e-bike error 21
- Bafang E-Code 21
- Bafang error 21
- Bafang speed sensor fault 21
- bicicleta eléctrica Bafang error 21
- Charging Base blocked by surrounding obstacles
- código 21 Bafang
- E-Code 21 Bafang
- error 21
- Error 21 height sensor
- error code 21 Bafang
- eufy Error 21
- eufy RoboVac Error 21
- fallo sensor velocidad Bafang
- Height sensor has been pressed
- iPhone error 21
- iTunes error 21
- Mi Electric Scooter error 21
- Ninebot codigo 21
- Ninebot error 21
- patinete Segway error 21
- patinete Xiaomi error 21
- Roborock Error 21
- RoboVac Error 21
- Segway error 21
- Segway Ninebot E2 Pro error 21
- Segway Ninebot error code 21
- Xiaomi bateria error 21
- Xiaomi error 21
- Xiaomi error 21 6 km/h
- Xiaomi scooter error 21
What it means
On eufy's voice alert page for the X8, LR20, LR30 and L35 series, Error 21 means the charging base is blocked by nearby obstacles and asks you to clear them before trying again. If something surrounds or covers the base, the robot cannot get back to it to charge. The code describes the base's surroundings, not a fault in the robot or base, and eufy only refers you to support if the alert continues.
Warnings and stop conditions
- Mediumeditorial warning
Do not open the charging base or its adapter: they connect to the mains. Clean the pins only with a clean dry cloth, as eufy advises.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
Symptoms and causes
Probable causes · in order
- Objects around the baseCommon
There is furniture, boxes or objects next to the base and the robot returns to it as soon as the area is cleared.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
- Base in a tight spotPossible
The base is wedged into a corner or a narrow hallway and the alert repeats even with no loose objects nearby.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
- Alert with the base clearLess common
The area around the base is clear, the base has power and Error 21 continues; eufy then refers you to its support.
Evidence: X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
Virtual technician
Does Error 21 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
X8/LR20/LR30/L35 Series RoboVac Voice Alerts and Solution
eufy · 2026 · official_doc
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