• Code: 530
• Description: Fusing fan motor error The fusing unit fan motor does not operate.
• Causes: • Voltage between pins 2 and 3 (CN9 on engine control board) abnormal (not +24V) • Defective fusing unit fan
• Remedy: 1. Replace the engine control board. 2. Replace the fusing unit fan.

• Code: 531
• Description: PSU cooling fan error The PSU cooling fan does not operate.
• Causes: • Voltage between pins 1 and 2 (CN8 on engine control board) abnormal (not +24V) • Defective PSU cooling fan
• Remedy: 1. Replace the engine control board. 2. Replace the PSU cooling fan.

• Code: 532
• Description: Fusing unit sub-cooling fan (left) error The fusing unit sub-cooling fan does not operate.
• Causes: • Voltage between pins 1 and 2 (CN9 on engine control board) abnormal (not +24V) • Defective sub-cooling fan
• Remedy: 1. Replace the engine control board. 2. Replace the sub-cooling fan.

• Code: 543
• Description: Heating belt overheat The temperature of the heating belt is out of the normal range.
• Causes: • Pin 1 (IC6) unable to turns to lower level • Defective IH power supply board • Thermistor short-circuited • Defective cable connection between CN15 and thermistor
• Remedy: 1. Replace the control board. 2. Replace the IH power supply board. 3. Replace the fusing unit. 4. Connect the cable between CN15 and the thermistor correctly.

• Code: 544
• Description: Heating belt low temperature error (1) The fusing unit thermistor in the middle of the unit has detected low temperature.
• Causes: • Defective connection between engine control board (CN15) and fusing unit • Defective thermistor • Defective connection between fusing unit and thermistor • Pin 7 (CN32 on engine control board) unable to send signal • Defective IH unit or IH power supply board
• Remedy: 5. Replace the IH unit or IH power supply board. 6. Connect the cable between the engine board and fusing unit correctly. 7. Replace the thermistor. 8. Connect the cable between fusing unit and thermistor correctly. 9. Replace the engine control board.

• Code: 554
• Description: Heating roller low temperature error (2) The fusing unit thermistor at the left end of the unit has detected much lower temperature than the other fusing unit thermistor does.
• Causes: • Defective connection between engine control board (CN15) and fusing unit • Defective thermistor • Defective connection between fusing unit and thermistor • Pin 7 (CN32 on engine control board) unable to send signal • Defective IH unit or IH power supply board
• Remedy: 5. Replace the IH unit or IH power supply board. 6. Connect the cable between the engine board and fusing unit correctly. 7. Replace the thermistor. 8. Connect the cable between fusing unit and thermistor correctly. 9. Replace the engine control board.

• Code: 580
• Description: Fusing belt rotation error The rotation of the fusing unit is not normal.
• Causes: • Defective fusing belt, gear, or rotation plate • Defective connection between engine control board (CN15) and fusing unit • Defective connection of fusing unit connector • Pin 4 (CN15) unable to send 1.4-second (or less) encoder pulse
• Remedy: 1. Replace the fusing unit. 2. Connect the cable between the engine control board (CN15) and fusing unit correctly. 3. Connect the fusing unit connector correctly. 4. Replace the engine control board.

• Code: 581
• Description: Fusing unit low voltage error The voltage applied to the fusing unit is out of the normal range.
• Causes: • Defective IH power supply board • Defective thermostat
• Remedy: 1. Replace the IH power supply board. 2. Replace the IH unit.