• Code: 541
• Description: Thermistor disconnection (heating roller)
  The fusing unit starts warm up to the print ready temperature. The temperature does not reach 0°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 4 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: Overheat error (heating roller)
  The heating roller thermistor detects 230 °C.
• Causes: • Short circuit • Defective BICU board • Defective PSU

• 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 12 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: 547
• Description: Zero cross error
  The main power is turned on and the machine checks how many zero-cross signals are generated during 500 ms. If the number of zero-cross signal generated is more than 66 or less than 45 and when this condition is detected 10 consecutive times, this code is displayed.
• Causes: • Replace the PSU. • FU12 is open.

• Code: 551
• Description: Thermistor disconnection (pressure roller)
  The pressure roller thermistor detects 7°C or lower for 80 seconds.
• Causes: • Thermistor loose connection • Defective harness • Defective connector