• Code: 551-00
• Description: Broken fusing (End) thermistor wire
  At least ten times, the temperature is detected to stay at 0 deg C or less for three seconds.
• Causes: - Broken thermistor wire - Bad connector contact
• Remedy: • Clear the SP: fusing SC. • Check the connector connection. • Replace the fusing (End) thermistor.

• Code: 552-02
• Description: Fusing (End) thermistor not reloaded 1
  The heating (End) thermistor does not reach 80 deg C 7.7 seconds after the start of heat control (during normal startup control)
• Causes: • Stained thermopile lens • Deformed or floating thermistor • Input voltage out of range • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Replace the Fusing Unit.

• Code: 552-03
• Description: Fusing (End) thermistor not reloaded 2
  The heating (End) thermistor does not reach 80 deg C 7.7 seconds after the start of heat control (during normal startup control)
• Causes: • Stained thermopile lens • Deformed or floating thermistor • Input voltage out of range • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Replace the Fusing Unit.

• Code: 552-04
• Description: Fusing (End) thermistor not reloaded 3
  The heating (End) thermistor does not reach 80 deg C 7.7 seconds after the start of heat control (during normal startup control)
• Causes: • Stained thermopile lens • Deformed or floating thermistor • Input voltage out of range • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Replace the Fusing Unit.

• Code: 553-00
• Description: Fusing (End) thermistor high-temperature detected (software)
  The temperature is detected to stay at 230 deg C or higher for one second.
• Causes: • Shorted triac • Failed Engine Board
• Remedy: • Clear the SP: fusing SC. • Replace the PSU. • Replace the Engine Board.

• Code: 554-00
• Description: Fusing (End) thermistor high-temperature detected (software)
  The hardware high-temperature error Sensor flag is detected at 10 ms intervals.
• Causes: • 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.

• Code: 555-00
• Description: Fusing (End) heater stay ON
  The fusing (End) heater stays ON for 8.6 seconds or more when in stand-by state (or the fusing roller is not rotating).
• Causes: • Deformed or floating thermistor • Broken fusing lamp wire • The overtemperature prevention mechanism started working
• Remedy: • CLEAR THE SP: FUSING SC. • Replace the thermistor. • Replace the fusing (End) lamp.

• Code: 557-00
• Description: Zero-crossing frequency exceeded
  The number of zero-crossing interrupts exceeds a certain value in 500 ms.
• Causes: The frequency of the commercial power supply line is unstable or noise occurs
• Remedy: