c-3721bizhub 251i

Konica Minolta bizhub 251i error C-3721: Fuser heat fault

Konica Minolta bizhub 251i error C-3721 means the fuser unit is not reaching operating temperature. The machine freezes to prevent print quality issues. Addressing the Konica Minolta bizhub 251i error C-3721 often requires a service visit.

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Common causes

  • 1Heater lamp failure
  • 2Broken thermistor

Solutions

Diagnóstico rápido

Usually occurs during the warm-up cycle.

Solución paso a paso

  1. Power off.
  2. Disconnect from power outlet.
  3. Wait 10 mins.
  4. Restart.

Prevención y mantenimiento

Use a surge protector.

Cuándo llamar a un técnico

If the error persists after reboot, the heating lamp is likely broken.

Ficha técnica del equipo

Steps to follow

  1. 1

    Shut down

    Power off immediately.

  2. 2

    Cooling

    Let it cool down.

  3. 3

    Reset

    Power on again.