Master the art of repairing T9 brush motors and turn it into profit.
Error 4 indicates a main brush motor failure, either due to jamming or electrical wear.
Listen for whining sounds or red light indicators signaling a stalled brush module.
Hair wrapping around the spindle forces the motor to draw excessive current, causing stalls.
Degraded bearings or worn carbon brushes increase friction, shortening the robot vacuum's lifespan.
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