004-345VersaLink C620

Xerox VersaLink C620 error 004-345: Fuser unit

The Xerox VersaLink C620 error 004-345 occurs when the fuser assembly fails to reach the necessary operating temperature for printing. This is a critical thermal fault, causing the machine to enter a protective shutdown state. It is commonly linked to electrical instability or component wear.

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Common causes

  • 1Lamp failure: The fuser's internal heating element has burnt out.
  • 2Voltage fluctuation: Power instability preventing consistent heating.
  • 3Temperature sensor: Faulty thermistor reading within the fuser unit.
  • 4Residue buildup: Low-quality toner creating insulation on fuser surfaces.

Solutions

Diagnóstico rápido

This code often appears during the warm-up cycle. If you notice a faint ticking sound or immediate shutdown after printing starts, the fuser is likely experiencing a thermal stabilization error.

Solución paso a paso

  1. Full shutdown: Unplug the printer for at least 15 minutes to allow the fuser to cool.
  2. Check power: Ensure the unit is connected to a wall outlet, not an extension cord.
  3. Clear vents: Check that the rear exhaust area is free of dust and obstructions.
  4. Power up: If the 004-345 returns after restart, internal service is required.

Prevención y mantenimiento

Avoid specialized coated media unless specified. Use high-quality original toner to prevent buildup on the rollers which interferes with heat regulation.

Cuándo llamar a un técnico

If the 004-345 error remains persistent after an initial cool-down cycle, the fuser unit likely needs replacement by a technician.

Ficha técnica del equipo

  • Technology: Color Laser.
  • Speed/Output: 50 ppm.
  • Connectivity: USB, Gigabit Ethernet.
  • Feed Capacity: 550-sheet standard tray.
  • Consumables: Xerox original C620 toner.
  • Usage: High performance office.
  • Drivers / official firmware

Steps to follow

  1. 1

    Full power down

    Turn off the device and unplug the power cord for 10 minutes.

  2. 2

    Check airflow

    Ensure the back of the printer has enough clearance for ventilation.

  3. 3

    Restart

    Plug directly into a stable wall outlet and power on.

Frequently asked questions

This indicates a heating issue within the fuser assembly, meaning the unit cannot reach the temperature needed to fix toner to the page.

The printer locks itself as a safety measure to avoid heat damage, but it needs prompt resolution by a service professional.

Non-genuine toners often leave residues on fuser rollers, which can disrupt heat transfer and cause thermal errors.

Keeping vents clear of debris and ensuring the printer is on a dedicated, stable power circuit is crucial.