• Code: E4-14
• Description: Fuser IH Driver Fan Rotation
• Causes: 1. Fan connector is disconnected. 2. Fan is defective. 3. EC PCB connector is disconnected. (CN704) 4. EC PCB is defective.

• Code: E4-20
• Description: Thermistor (TH1) Open Error
• Causes: 1. Thermistor (TH1) is defective. 2. Thermistor (TH1) connector is disconnected. 3. Fuser Unit Relay connector is disconnected. 4. EC PCB connector is disconnected. (CN502) 5. EC PCB is defective.

• Code: E4-21
• Description: Thermistor (TH2) Open Error
• Causes: 1. Thermistor (TH2) is defective. 2. Thermistor (TH2) connector is disconnected. 3. Fuser Unit Relay connector is disconnected. 4. EC PCB connector is disconnected. (CN502) 5. EC PCB is defective.

• Code: E4-22
• Description: Thermistor (TH3) Open Error
• Causes: 1. Thermistor (TH3) is defective. 2. Thermistor (TH3) connector is disconnected. 3. Fuser Unit Relay connector is disconnected. 4. EC PCB connector is disconnected. (CN502) 5. EC PCB is defective.

• Code: E4-23
• Description: Thermistor (TH4) Open Error
• Causes: 1. Thermistor (TH4) is defective. 2. Thermistor (TH4) connector is disconnected. 3. Fuser Unit Relay connector is disconnected. 4. EC PCB connector is disconnected. (CN502) 5. EC PCB is defective.

• Code: E4-24
• Description: Thermistor (TH1) High Temperature Error
• Causes: 1. Thermistor (TH1) is defective. 2. Thermistor (TH1) connector is disconnected. 3. Induction Heating (IH) PCB is defective. 4. EC PCB connector is disconnected. (CN508) 5. EC PCB is defective.

• Code: E4-25
• Description: Thermistor (TH2) High Temperature Error
• Causes: 1. Thermistor (TH1) is defective. 2. Thermistor (TH1) connector is disconnected. 3. Contact of Thermistor (TH1) and Heater Belt is abnormal. 4. Thermistor (TH2) is defective. 5. Thermistor (TH2) connector is disconnected. 6. Induction Heating (IH) PCB is defective. 7. EC PCB connector is disconnected. 8. EC PCB is defective.

• Code: E4-26
• Description: Thermistor (TH3) High Temperature Error
• Causes: 1. Thermistor (TH1) is defective. 2. Thermistor (TH1) connector is disconnected. 3. Contact of Thermistor (TH1) and Heater Belt is abnormal. 4. Thermistor (TH3) is defective. 5. Thermistor (TH3) connector is disconnected. 6. Induction Heating (IH) PCB is defective. 7. EC PCB connector is disconnected. 8. EC PCB is defective.