• Code: SC545-00
• Description: Fusing (Center) lamp stays ON
• Causes: The thermistor (center) has not detected the target temperature, even after the fusing lamp stays ON for more than 30 seconds after reloading. • Deformed or floating thermistor • Broken fusing lamp wire • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Replace the fusing thermistor. • Replace the fusing (Center) lamp.

• Code: SC547-01
• Description: Zero-crossing error (adhered relay contact)
• Causes: When the fusing relay is in an OFF state, a "zero-crossing interrupt request" occurs in 50 ms. Damaged fusing relay (adhered contact)
• Remedy: • Turn the main power OFF and then ON. • Replace the harness. • Replace the PC board. • Replace the PSU.

• Code: SC547-02
• Description: Zero-crossing error (bad relay contact)
• Causes: If a "zero-crossing interrupt request" does not occur when the fusing relay is in an ON state, an error results. - Damaged fusing relay (open contact) - Failed fusing relay drive circuit - PSU fuse (24VS) blown
• Remedy: • Turn the main power OFF and then ON. • Replace the harness. • Replace the Engine Board. • Replace the PSU. • Replace the fuse.

• Code: SC547-03
• Description: Zero-crossing error (low frequency error)
• Causes: The number of zero-crossing interrupts does not reach a certain value in 500 ms. The frequency of the commercial power supply is unstable.
• Remedy: • Turn the main power OFF and then ON. • Check the commercial power supply. • Replace the harness. • Replace the Engine Board. • Replace the PSU.

• Code: SC551-00
• Description: Broken fusing (End) thermistor wire
• Causes: At least ten times, the temperature is detected to stay at -20 deg C or less for 5 seconds. • Broken thermistor wire • Bad connector contact
• Remedy: • Clear the SP: fusing SC. • Check the connector connection. • Replace the fusing (End) thermistor.

• Code: SC553-01
• Description: Fusing (End) thermistor high-temperature detected (software)
• Causes: In a condition of 235 degrees C or higher temperature, the temperature has increased more than 10 degrees C per 1 second, the heater has continuously reached 100% (maximum) duty, and the center thermistor has detected the failure to reach the target temperature by 11 degrees C. • Shorted triac • Failed Engine Board
• Remedy: • Clear the SP: fusing SC. • Replace the PSU. • Replace the Engine Board.

• Code: SC553-02
• Description: Fusing (End) thermistor high-temperature detected (software)
• Causes: The temperature is detected to stay at 245 deg C or higher for one second. • Shorted triac • Failed Engine Board
• Remedy: • Clear the SP: fusing SC. • Replace the PSU. • Replace the Engine Board.

• Code: SC554-00
• Description: Fusing (End) thermistor high-temperature detected (hardware)
• Causes: The hardware high-temperature error sensor flag is detected. • Damaged triac (shorted) • Failed engine control board • Failed fusing thermopile • Failed fusing thermistor • Abnormal fusing control software behavior • The PWM signal is continuously supplied from the IH inverter (due to a software or temperature sensor error).
• Remedy: • Clear the SP: fusing SC. • Replace the PSU. • Replace the Engine Board. • Replace the fusing thermopile. • Replace the Fusing Unit.