e004imageCLASS LBP243dw

Canon imageCLASS LBP243dw error e004: Troubleshooting

The Canon imageCLASS LBP243dw error e004 is a technical alert indicating a fault within the fixing unit or fuser. It occurs when the internal sensor detects that the unit temperature is unstable or failing to reach the parameters required to bond the toner to the paper. This error requires a cooling pause to attempt a logical system reset.

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Common causes

  • 1Thermistor failure: Out-of-calibration temperature sensor.
  • 2Overheating: Overly long print cycles without ventilation.
  • 3Non-compatible toner: Particles sticking to the fuser and causing hot spots.
  • 4Power failure: Unstable voltage affecting the heating unit.

Solutions

Diagnóstico rápido

The e004 displays on the LCD, preventing printing. It is common when the printer overheats after long print runs or if the power supply is inconsistent.

Solución paso a paso

  1. Power down: Switch off the printer and disconnect it from the network.
  2. Cooling: Allow the unit to rest for at least 20 minutes.
  3. Connection: Ensure it is connected directly to a wall outlet (avoid power strips or UPS units that are not suitable).
  4. Test: Power on the device and wait for the warm-up cycle.

Prevención y mantenimiento

Always use genuine toner cartridges, as poor dust distribution can stress the fuser. Regularly clean the pickup rollers to avoid jams that cause thermal stress.

Cuándo llamar a un técnico

If the error persists after the above steps, the fuser lamp or heat sensor is defective and needs professional replacement.

Ficha técnica del equipo

  • Technology: Laser Monochrome Printer
  • Speed/performance: 40 ppm
  • Connectivity: USB, Ethernet, Wi-Fi
  • Feed capacity: 250-sheet tray
  • Compatible consumable: Canon 070 / 070H cartridge
  • Recommended usage: High-volume offices
  • Official drivers / firmware

Steps to follow

  1. 1

    Safety pause

    Unplug the printer for 20 minutes to allow the fuser to cool down.

  2. 2

    Check connections

    Verify that the power cord is plugged into a direct wall outlet.

  3. 3

    Power up

    Turn on the printer so the system can run a self-test.

Frequently asked questions

The Canon imageCLASS LBP243dw error e004 means that the fuser sensor has detected an anomaly in the toner fixing temperature.

Yes, the device locks itself to prevent further damage to the fuser or toner cartridge.

It uses the Canon 070 or 070H cartridge series.

Keep the printer in a well-ventilated area and always use original toner.

Canon imageCLASS LBP243dw error e004: Troubleshooting | Vimazdev