• Code: 6000
• Description: Broken fuser heater wire (main) During warm up, the temperature detected by the center thermistor does not reach 100 °C/212.0 °F for 20 s. During warm up, the temperature detected by the center thermistor does not reach the stable display temperature for 30 s, after it reaches 100 °C/212.0 °F.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. If the fuser heater is not turned on (broken thermostat wire), replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC34): 30 ppm model - Engine PWB(YC6): 35/40 ppm models 2. Replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6020
• Description: Fuser thermistor 1 High temperature error The temperature detected by the thermistor 1 (center) exceeded 240 °C/464.0 °F for 1s in succession.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Check if the fuser roller has foreign objects such as the toner contamination. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 4. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 5. Replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC34): 30 ppm model - Engine PWB(YC6): 35/40 ppm models 2. If the fuser heater is turned on at all times, replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Check if the engine PWB is properly secured with screws. 3. Replace the engine PWB.

• Code: 6030
• Description: Fuser thermistor 1 wire break In case the fuser thermistor 1 (center) detects low temperature for 1.6s while the fuser thermistor 2 (edge) detects the temperature of 30 °C/86 °F or more.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. Replace the fuser unit.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6040
• Description: Fuser heater error In case the input from the fuser thermistor 1 (center) is abnormal for 1s in succession. The fuser unit detection port is at H level for 1s in succession in all the operation mode.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the fuser unit.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.
  Fuser thermistor 1 Replace the fuser unit.
  Fuser thermostat (wire break) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Low voltage power supply PWB(YC102): 30 ppm model - Low voltage power supply PWB(YC2) : 35/40 ppm models 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the fuser unit.

• Code: 6050
• Description: Fuser thermistor 1 Low temperature error In case the temperature detected by the thermistor 1 (center) continues 100 °C/212.0 °F or less for 1 second during ready. In case the temperature detected by the thermistor 1 (center) continues 70 °C/ 158.0 °F or less for 1 second during low power mode.
• Remedy: Reduction of the power supply voltage 1. Check that no voltage drop of more than 10% of the rated is caused during printing. 2. If the power is overloaded, change the AC outlet that supplies power.
  Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. If the fuser heater is not turned on (broken thermostat wire), replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC105): 30 ppm model - Engine PWB(YC40): 35/40 ppm models 2. Replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6200
• Description: Fuser heater error (sub) In case the temperature detected by the fuser thermistor (edge) does not reach 100 °C/212.0 °F when turning on the sub heater for 30s in succession during warm-up. In case the temperature detected by the fuser thermistor (center) does not reach the Ready temperature when turning on the main heater for 30s in succession after the temperature detected by the fuser thermister (edge) reachs 100 °C/212.0 °F during warm-up.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. If the fuser sub heater is not turned on (broken thermostat wire), replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC105): 30 ppm model - Engine PWB(YC40): 35/40 ppm models 2. Replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.

• Code: 6220
• Description: Fuser heater high temperature error (sub) The temperature detected by the fuser thermistor 2 (edge) exceeded 240 °C/ 464.0 °F for 1s in succession.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Check if the fuser roller has foreign objects such as the toner contamination. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 4. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 5. Replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Engine PWB(YC105): 30 ppm model - Engine PWB(YC40): 35/40 ppm models 2. If the fuser heater is turned on at all times, replace the low voltage power supply PWB.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Check if the engine PWB is properly secured with screws. 3. Replace the engine PWB.

• Code: 6230
• Description: Fuser thermistor 2 wire break Fuser thermistor 2 (edge) detects low temperature for 1.6 s
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Engine PWB(YC7): 30 ppm model - Engine PWB(YC11): 35/40 ppm models 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. Replace the fuser unit.
  Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the engine PWB.