e804imageRUNNER 2004N

Error E804 Canon imageRUNNER 2004N: Cooling Fan Failure

The Canon imageRUNNER 2004N error E804 is a warning indicating that the cooling fan is not operating correctly. Why does error E804 appear on my Canon? It happens when the control system detects a failure in the cooling fan speed. Maintaining proper ventilation is the first defense against this critical issue.

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Common causes

  • 1Cooling fan motor failure.
  • 2Obstruction of fan blades by lint or dust.
  • 3Disconnected fan cable inside the printer.
  • 4Defective RPM sensor signal.

Solutions

Diagnóstico rápido

If the printer display shows E804, it means the main system fan isn't reaching its target speed. You should be able to hear the fan; if it's silent, the hardware failure is confirmed.

Solución paso a paso

  1. Clean vents: Use compressed air to remove accumulated dust from the side vents.
  2. Check clearance: Move the printer so it is not pushed directly against a wall.
  3. Power-up test: Restart the unit; if the error code returns, the fan unit is likely defective.

Prevención y mantenimiento

Monthly dust removal from the side intake vents is key. Proper environment cooling ensures the fan doesn't need to spin at maximum velocity all the time, extending its lifespan.

Cuándo llamar a un técnico

If external cleaning fails to resolve the code, the fan motor has likely failed. A technician is required to access the internal casing to replace the component.

Ficha técnica del equipo

  • Technology: Laser
  • Speed: 20 ppm
  • Connectivity: USB/Ethernet
  • Feed capacity: 330 sheets
  • Consumables: C-EXV 42
  • Usage: Small office
  • Drivers / official firmware

Steps to follow

  1. 1

    Ensure clearance

    Make sure the device has at least 4 inches of clearance from the wall to allow for proper airflow.

  2. 2

    Clear vents

    Use compressed air to blow out dust from the side ventilation grids.

  3. 3

    Listen for fan

    Turn the printer on and listen for the fan spinning; silence indicates a mechanical failure.

Frequently asked questions

Error E804 triggers when the main cooling fan is not spinning or is under-speed, preventing proper cooling.

Yes, power it down immediately to prevent overheating and internal component damage.

Using genuine C-EXV 42 toner is best practice, as it works efficiently with the printer's thermal load.

Keep the machine in a clean, dust-free environment and ensure vents are never blocked.

Error E804 Canon imageRUNNER 2004N: Cooling Fan Failure | Vimazdev