• Code: 551
• Description: Thermistor disconnection (pressure roller) The pressure roller thermistor detects7°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)

• Code: 553
• Description: Overheat error (pressure roller) The pressure roller thermistor detects 220°C for 5 seconds.
• Causes: • Loose connection • Defective BCU board • Defective PSU

• Code: 554
• Description: Low temperature error (pressure roller) During standby or operation, the pressure roller thermistor detects 80°C or less for 5 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (thermistor loose connection, fusing - drawer loose connection)

• Code: 555
• Description: Full power error (pressure roller) Fusing unit warm-up is complete.- The fusing pressure roller stops turning. - The pressure roller lamp keeps outputting the maximum power for 200 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 556
• Description: Unstable temperature (pressure roller) • The pressure roller thermistor detects unstable temperature increases or decreases within 60 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 560
• Description: Zero cross error The main switch is turned on; the fusing relay turns on. - 50 Hz or 60 Hz is not detected within 5 seconds.
• Causes: • Defective relay circuit • Defective PSU • Incorrect power supply

• Code: 640
• Description: BCU – Controller communication error (no response)
• Causes: Turn the main switch off and on. Replace the controller. Replace the BCU.