• Code: H3-00
• Description: Main heater lamp abnormally high temperature hard detection trouble
  The fusing main heater thermistor causes abnormally high temperature.
• Causes: Main heater lamp thermistor defect Control PWB failure Fusing section connector contact failure
• Remedy: Check the main heater lamp blinking with SIM 5-2-1. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H3-01
• Description: Sub heater lamp abnormally high temperature hard detection troubl
  The fusing sub heater thermistor causes abnormally high temperature.
• Causes: Sub heater lamp Thermistor defect Control PWB failure Fusing section connector contact failure
• Remedy: Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H3-10
• Description: Main heater lamp abnormally high temperature soft detection trouble
  A/D value the fusing main heater lamp thermistor causes abnormally high temperature (over 230°C).
• Causes: Main heater lamp thermistor defect Control PWB failure Fusing section connector contact failure
• Remedy: Check the main heater lamp blinking with SIM 5-2-1. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H3-11
• Description: Sub heater lamp abnormally high temperature soft detection trouble
  A/D value the fusing sub heater lamp thermistor causes abnormally high temperature (over 230°C).
• Causes: Sub heater lamp thermistor defect Control PWB failure Fusing section connector contact failure
• Remedy: Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H4-00
• Description: Main heater lamp abnormally low temperature detection
  The setup temperature (about 90°C) is not reached within the specified time (about 17sec) from turning on the power ON SW. (When the temperature of main heater lamp thermistor falls below 140°C in the standby mode or printing.) Whether temperature of main heater lamp thermistor falls below 50°C in the pre-heat mode.
• Causes: Main heater lamp thermistor defect Main heater lamp failure Main thermostat failure Control PWB failure
• Remedy: Check the heater lamp blinking with SIM 5- 2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp does not light: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H4-01
• Description: Sub heater lamp abnormally low temperature detection
  The setup temperature (about 90°C) is not reached within the specified time (about 17sec) from turning on the power ON SW. (When the temperature of sub heater thermistor falls below 140°C in the standby mode or printing.) Whether temperature of sub heater lamp thermistor falls below 50°C in the pre-heat mode.
• Causes: Sub heater lamp thermistor defect Sub heater lamp failure Sub thermostat failure Control PWB failure
• Remedy: Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp does not light: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H4-20
• Description: Main heater lamp abnormally low temperature detection
  The setup temperature (about 25°C: Sim 43-1-1) is not reached within the specified time (about 32sec) from turning on the power ON SW. (When the temperature falls below 140°C in the standby mode.)
• Causes: Main heater thermistor defect Main heater lamp failure Main thermostat failure Control PWB failure
• Remedy: Check the main heater lamp blinking with SIM 5-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp does not light: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.

• Code: H4-21
• Description: Sub heater lamp abnormally low temperature detection
  The setup temperature (about 25°C: Sim 43-1-1) is not reached within the specified time (about 32sec) from turning on the power ON SW. (When the temperature falls below 140°C in the standby mode.)
• Causes: Sub heater thermistor defect Sub heater lamp failure Sub thermostat failure Control PWB failure
• Remedy: Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp does not light: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power PWB and the MCU PWB lamp control circuit. Clear the display of self-diagnostics with SIM 14.