E4
Hoover
Main Brush Motor Stall / Overcurrent
Robot vacuum shows E4 or four beeps and stops; may say 'main brush error' or 'roller brush blocked'.
Advertisements
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.
Advertisements
Possible Causes
Hair and fibers wrapped around main brush ends, Debris jammed in brush housing, Worn main brush bearings, Faulty main brush motor
How to Fix / Troubleshooting
Safety first: Switch the robot OFF and remove it from the dock.
- Remove the main brush: Open the brush guard on the underside. Lift out the Hoover main roller brush.
- Clean brush and end caps: Remove hair and threads from the bristles and especially from the end caps. Many Hoover brushes have removable end caps—pull them off and clean the shafts thoroughly.
- Clean brush housing: Vacuum or wipe out dust and debris from the brush channel and suction inlet.
- Inspect bearings: Check that the brush end caps spin freely. If they feel rough or seized, replace the main brush.
- Reassemble: Refit the brush, ensuring the keyed ends are fully seated in their sockets, and close the brush guard securely.
- Test: Start a cleaning cycle and listen for abnormal grinding or squealing.
- If E4 persists: The main brush motor or its gearbox may be worn. Replace the main brush motor assembly (requires removing bottom cover, disconnecting motor wires, and installing a new unit).
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Main Brush Motor Assembly
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements