• Code: C6100
• Description: Fuser heater 2 break
  Fuser thermistor 2 detected less than 100C/212F for 120 s during driving. Fuser thermistor 2 deduced less than 150C/302F for 300 s during driving. Fuser thermistor 2 deduced less than 100C/212F for 5 s during driving.
• Causes: Defective fuser heater 2.
  Defective fuser thermostat 2.
  Installation defectiveness on fuser thermistor 2.
  Defective PWB.
• Remedy: Defective fuser heater 2. Check for continuity across each heater. If none, replace the fuser unit.
  Defective fuser thermostat 2. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit.
  Installation defectiveness on fuser thermistor 2. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6120
• Description: Abnormally high fuser thermistor 2 temperature
  The fuser temperature exceeds 190C/ 374F for 1 s.
• Causes: Installation defectiveness on fuser thermistor 2.
  Defective PWB
• Remedy: Installation defectiveness on fuser thermistor 2. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6130
• Description: Fuser thermistor 2 break error Fuser thermistor 2 detects a temperature of 30 C/86F or lower for 45 s.
• Causes: Installation defectiveness on fuser thermistor 2.
  Defective fuser heater 2.
  Defective PWB.
• Remedy: Installation defectiveness on fuser thermistor 2. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective fuser heater 2. Check for continuity across each heater. If none, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6200
• Description: Fuser heater 1 edge break
  During warming up, fuser thermistor 1 does not detect temperature rise of 1C/ 1.8F for 10 s. Fuser thermistor 1 does not reach 90F even after 30 s during warming up.
• Causes: Defective fuser heater 1.
  Defective fuser thermostat 1.
  Installation defectiveness on fuser thermistor 1.
  Defective PWB.
• Remedy: Defective fuser heater 1. Check for continuity across each heater. If none, replace the fuser unit.
  Defective fuser thermostat 1. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit.
  Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6220
• Description: Abnormally high fuser thermistor 1 edge temperature
  The fuser temperature exceeds 250C/ 482F for 1 s.
• Causes: Installation defectiveness on fuser thermistor 1.
  Defective PWB.
• Remedy: Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6230
• Description: Fuser thermistor 1 edge break error Fuser thermistor 1 detects a temperature of 40C/104F or lower for 30 s.
• Causes: Defective fuser heater 1.
  Installation defectiveness on fuser thermistor 1.
  Defective PWB.
• Remedy: Defective fuser heater 1. Check for continuity across each heater. If none, replace the fuser unit.
  Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6400
• Description: Zero-cross signal error
  While fuser heater ON/OFF control is performed, the zero-cross signal is not input within 3 s.
• Causes: Poor contact in the connector terminals.
  Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC4 on the engine PWB and the connector YC10 on the power source PWB, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective PWB. Replace the engine PWB or power source PWB and check for correct operation.

• Code: C6410
• Description: Fuser unit type mismatch problem
  Absence of the fuser unit is detected.
• Causes: Fuser unit connector inserted incorrectly.
  Different type of the fuser unit is installed.
• Remedy: Fuser unit connector inserted incorrectly. Reinsert the fuser unit connector if necessary.
  Different type of the fuser unit is installed. Install the correct fuser unit.