Analysis of Common Fault Codes for Commercial Induction Cookers

Basic Codes

E1: No pot detected alarm; E2: Coil temperature protection; E3: Open circuit of the coil temperature sensor; E4: Short circuit of the IGBT thermistor; E5: Open circuit of the IGBT thermistor; E6: Over-temperature of the pot bottom; E7: Short circuit of the pot thermistor; E8: Insufficient power supply voltage; E9: Excessive power supply voltage

Notes: After powering on, the display lights up fully once, followed by the red light (power indicator) flashing while the blue light remains off. If the display shows no change when the rotary switch is turned, it indicates that the rotary switch is damaged, or the relevant plug is loose, or the motor is malfunctioning. In this case, replace the switch potentiometer (encoder). If the issue persists, there may be an abnormality in the related circuit.

1. Code E1: No pot detected. After powering on, E1 is displayed (the unit shows 1 or “-” after a few seconds), and the red light flashes simultaneously with “-“.

   • A. For stir-fry stoves/flat-top low-soup stoves, check if a pot is placed. If not, place a pot and observe if it functions normally.
   • B. For large-pot stoves or other cases where a pot is already placed but still shows 1, check if the distance between the coil and the pot has changed or if the pot is magnetic. Use a dedicated pot in this case.
   • C. If the red light is on, displaying the current gear setting, and the blue light flashes once and then goes out repeatedly, it indicates either an incorrect pot or the coil is too far from the pot.

2. Code E2: Over-temperature protection of the pot (coil). After powering on for a while, E2 appears. Check if the coil fan is operating. If it is, it is likely due to the deterioration of the coil thermistor. In this case, replace the coil temperature measurement socket.

3. Code E3: Open circuit of the pot thermistor. Replace the coil temperature measurement socket.

4. Code E4: Over-temperature of the IGBT thermistor. The cooling fan on the mechanism does not rotate or rotates too slowly. Check the fan and its plug. If both are functioning properly, the relay may be damaged. The emergency repair method is to damage the outer casing of the relay, effectively keeping the relay contacts closed. However, clearly inform the customer that the fan will rotate when powered on, but it will not affect usage.

5. Code E5: Open circuit of the IGBT thermistor. In this case, it is best to replace the mechanism or have a professional repair technician disassemble the board and replace the aluminum plate temperature measurement socket.

6. Code E6: Insufficient power supply voltage.

7. Code E7: Short circuit of the pot thermistor. Fault in the pot bottom temperature measurement socket. Replace it to resolve the issue.

8. Code E8: Short circuit of the IGBT thermistor. In this case, it is best to replace the mechanism or have a professional repair technician disassemble the board and replace the aluminum plate temperature measurement socket.

9. Code E9: Excessive power supply voltage.