• Code: 541
• Description: Thermistor disconnection (heating roller)
  The fusing unit starts warm up to the print ready temperature. → The temperature does not reach 7°C for 10 seconds.
• Causes: • Defective thermistor • Thermistor loose connection • Defective connector

• Code: 542
• Description: Fusing warm-up timeout (heating roller)
  The main switch is turned on or a cover is closed. → The heating roller does not reach the warm-up temperature within 50 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (loose thermistor connection, fusing - drawer loose connection)

• Code: 543
• Description: Overheat error (heating roller)
  The heating roller thermistor detects 220°C for 5 seconds.
• Causes: • Short circuit • Defective BICU board • Defective PSU

• Code: 544
• Description: Low temperature error (heating roller)
  During standby or operation, the heating roller thermistor detects 100 °C or less for 5 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (loose thermistor connection, fusing - drawer loose connection)

• Code: 545
• Description: Full power error (heating roller)
  Fusing unit warm-up is complete. → The heating roller stops turning. → The heating roller lamp keeps outputting the maximum power for 30 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 546
• Description: Unstable temperature (heating roller)
  The heating roller thermistor detects unstable temperature increases or decreases within 60 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 551
• Description: Thermistor disconnection (pressure roller)
  The pressure roller thermistor detects 7°C or lower for 30 seconds.
• Causes: • Thermistor loose connection • Defective harness • Defective connector

• Code: 552
• Description: Warm-up time over (pressure roller)
  The main switch is turned on or a cover is closed. → The fusing pressure roller does not reach the ready temperature within 200 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (thermistor loose connection, fusing - drawer loose connection)