Error 18
Xiaomi
Fan Speed Control or Tachometer Error
Robot vacuum reports 'Error 18' / voice prompt 'Error 18: Fan speed error' or similar, with unstable suction.
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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
Clogged filter causing overcurrent, Faulty fan tachometer sensor, Damaged fan driver MOSFET on mainboard, Loose fan connector
How to Fix / Troubleshooting
Safety first: Turn off the robot and remove the dustbin before working near the fan inlet.
- 1. Replace or clean filter:
- Remove the HEPA/filter and either clean (if washable type) or replace with a new Xiaomi-compatible filter.
- 2. Check for clogs:
- Inspect the dustbin and suction channel for blockages.
- Remove any debris with a brush or vacuum.
- 3. Test fan operation:
- Reassemble and start a cleaning cycle.
- Listen for fan speed fluctuations or abnormal noises.
- 4. Advanced diagnostics:
- Open the robot and check the fan connector on the mainboard.
- If the fan spins erratically or not at all, replace the fan module.
- 5. If a new fan does not fix the issue:
- The mainboard fan driver circuit may be defective; replace the mainboard.
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Repair Difficulty
Hard
4/5
Required Part
Vacuum Fan Motor Assembly
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