e804-0000imageRUNNER ADVANCE DX 4945i

Canon imageRUNNER ADVANCE DX 4945i error E804: Fix

The Canon imageRUNNER ADVANCE DX 4945i error E804 triggers when the controller board detects an inconsistent rotation speed in the cooling system. This is a vital alert to prevent heat buildup. As users ask why does my machine show error E804, they often realize that environmental dust is the primary contributor.

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Common causes

  • 1Physical obstruction of fan blades by debris.
  • 2Mechanical bearing failure in the fan motor.
  • 3Loose cabling to the fan speed sensor.
  • 4Operating environment with poor thermal circulation.

Solutions

Quick Diagnosis

The E804 error occurs when the main cooling fan fails to meet the expected RPM threshold. The machine locks down to safeguard electronic components. If you notice dust clogging the side vents, it is highly likely that fan efficiency has dropped.

Step-by-Step Fix

  1. Check for obstructions: Ensure no papers or office furniture are blocking the cooling airflow.
  2. Power reset: Turn the machine off and wait for 5 minutes before powering it back on to reset sensors.
  3. Ventilation cleaning: Use compressed air to carefully clean the external intake grilles.

Maintenance and Prevention

Keeping ventilation paths clear is critical. We recommend a biannual preventive maintenance service to remove internal dust that affects fan motor longevity. Use of genuine Canon toner helps minimize internal toner scatter.

When to Call a Technician

If the error continues after cleaning, the fan motor may have suffered a permanent mechanical failure and needs professional replacement.

Device Technical Sheet

  • Technology: High-Efficiency Multifunction Laser.
  • Speed: 45 ppm.
  • Cooling system: PWM-controlled forced-flow fans.
  • Compatible Consumables: Original GPR-43 toner series.
  • Connectivity: Ethernet / USB.
  • Official Drivers / firmware

Steps to follow

  1. 1

    Check for obstructions

    Ensure no external objects or dust buildup are blocking the ventilation grilles.

  2. 2

    Power reset

    Turn the power off and on to reset the fan speed sensor signal.

  3. 3

    Technical verification

    Listen for abnormal noises or check if the device feels excessively hot.

Frequently asked questions

The system detects an irregularity in the internal cooling fan's RPM, forcing a shutdown to prevent thermal damage.

Yes, operating without proper ventilation can permanently damage the main controller board.

The model uses GPR-43 series toner to ensure clean operation within the chassis.

Perform a monthly external cleaning of the air intake vents with compressed air.