• Code: 6730
• Description: Abnormally high IGBT1 temperature (IHPWB)
• Causes: Defective PWB. Defective cooling fan motor.
• Remedy: Defective PWB. Replace the IH PWB and check for correct operation.
  Defective cooling fan motor. Replace the IH fan motor.

• Code: 6740
• Description: Abnormally high IGBT2 temperature (IHPWB)
• Causes: Defective PWB. Defective cooling fan motor.
• Remedy: Defective PWB. Replace the IH PWB and check for correct operation.
  Defective cooling fan motor. Replace the IH fan motor.

• Code: 6750
• Description: Abnormally output overcurrent (IHPWB)
• Causes: Defective PWB. Defective fuser unit.
• Remedy: Defective PWB. Replace the IH PWB and check for correct operation.
  Defective fuser unit. Replace the fuser unit.

• Code: 6760
• Description: Abnormally AC input overcurrent (IHPWB)
• Causes: Defective PWB.
• Remedy: Replace the IH PWB and check for correct operation.

• Code: 6770
• Description: Abnormally low electric power (IHPWB)
• Causes: Defective connector cable or poor contact in the connector. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable.
  Defective PWB. Replace the IH PWB and check for correct operation.

• Code: 6930
• Description: IH coil fan motor error
  The alarm signal was detected for 5 seconds continuously during operation.
• Causes: Defective connector cable or poor contact in the connector. Defective cooling fan motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. IH coil fan motor and engine PWB(YC21)
  Defective cooling fan motor. Replace the container fan motor.
  Defective PWB. Replace the engine PWB and check for correct operation.

• Code: 6950
• Description: IH CPU communication error
  A communication error is detected 3 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable.
  Defective PWB. Replace the IH PWB or the engine PWB and check for correct operation.

• Code: 6990
• Description: Fuser unit type mismatch problem
  Absence of the fuser unit is detected.
• Causes: Defective PWB.
• Remedy: Replace the IH PWB and check for correct operation.