Error 18 — Suction fan error
The main suction fan motor reports a fault — over-current, stalled, or thermally tripped.
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Typical cost
- $10-20 (2-3 pack)
- Verified against
- global.roborock.com ↗
The fix
Roborock washable HEPA filter
Main suction fan motor over-current, stalled, or thermally tripped
Diagnose first: A blocked filter or airway overheating the fan is the most common trigger — clean the filter and dustbin, clear the intake, and update firmware before assuming motor failure. The fan motor itself is a moderate-to-advanced repair (removing the top cover and PCB); if the robot is still under warranty, go through Roborock support rather than swapping the motor yourself.
Find this part on Amazon →Didn't resolve it? Next suspect: Roborock main fan motor replacement ($30-55)
As an Amazon Associate we earn from qualifying purchases.
How to fix it
- Remove and clean the filter and dustbin thoroughly.
- Inspect the dust intake on the chassis for obstructions — clear with tweezers.
- Power-cycle the robot and try a fresh cleaning run.
- Listen for grinding or whining — if present, the fan motor needs service.
- If the robot is under warranty, contact Roborock support before disassembling.
- Out of warranty: replacement of the main fan motor requires removing the top cover and PCB — moderate skill needed.
Why it happens
Typical signs: Voice prompt 'Fan motor is malfunctioning' · App shows Error 18 · No suction during cleaning · Loud whining or grinding from main motor · Robot stops shortly after starting
- Severely blocked filter or airway Restricted airflow overheats and trips the fan motor.
- Foreign object in fan path Object sucked into the fan housing.
- Fan motor end-of-life Brushes/bearings worn after years of use.
- Wet debris inside vacuum path Liquid damage to motor windings.
More Roborock robot vacuum codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: global.roborock.com.