Common Faults and Repair Methods of Commercial Induction Cookers – Lestov Manufacturer
Commercial induction cookers are important equipment in modern kitchens. They are widely used in the catering industry due to their high efficiency, energy saving, and environmental protection. However, due to their complex working environment and high frequency of use, various faults are inevitable. This article will analyze the common faults of commercial induction cookers in detail and provide professional repair methods to help maintenance personnel quickly diagnose and solve problems.
I. Power system failure
1. The whole machine does not respond (fault code E0/E1)
(1) Fault phenomenon
- After power is turned on, the induction cooker does not respond, the display screen is not lit, and the buttons do not respond.
- It may be accompanied by a circuit breaker trip or heating of the power cord.
(2)Fault cause and repair method
| External manifestation | Reason | Repair method |
| Power input abnormality | The voltage is too high or too low, and the power cord has poor contact. | ① Use a multimeter to measure the power supply voltage and ensure it is within the AC 180V-250V range. ② Check if the power cord is damaged and ensure that it is firmly connected. |
| Fuse blown | Usually caused by a short circuit or overload | ① Find the fuse on the power board (usually 10A-15A) and use a multimeter to check whether it is blown. ② Replace the fuse with the same specification and pay attention to the short circuit point. |
| Rectifier bridge stack damage | The rectifier bridge stack breaks down or is open circuited. | ① Use the multimeter diode mode to measure the input and output ends of the rectifier bridge stack. Under normal circumstances, the forward direction is on and the reverse direction is off. ② If damaged, replace the rectifier bridge stack of the same model. |
| Main control board failure | The power management chip or related circuits are damaged. | ① Measure the power supply voltage of the main control board (usually 5V and 18V). If abnormal, check the power management chip and peripheral circuits. ② Replace damaged components or the entire main control board. |
II. Heating system failure
1. No heating (fault code E2/E3)
(1) Fault phenomenon
- The induction cooker can be turned on after being powered on, but it cannot heat.
- It may be accompanied by an alarm sound or a fault code on the display.
(2)Fault cause and repair method
| External manifestation | Reason | Repair method |
| IGBT module damage | IGBT breakdown or open circuit. | ① Use a multimeter to measure the G, C, and E poles of the IGBT. Under normal circumstances, the resistance between the G-E poles is several hundred ohms, and the resistance between the C-E poles is infinite. ② If damaged, replace the IGBT of the same model. |
| Resonant capacitor failure | Capacitor capacity decreases or leaks. | ① Use a capacitance meter to measure the resonant capacitance (usually 0.27μF-0.33μF). If the capacitance deviation exceeds ±10%, it needs to be replaced. ② When replacing, pay attention to the withstand voltage value (usually above 1200V). |
| Current transformer failure | The secondary coil is open or has abnormal resistance. | ① Use a multimeter to measure the resistance of the secondary coil (usually 2.2kΩ±5%). If it is open or the resistance is abnormal, it needs to be replaced. |
| Driver circuit problem | The drive signal is lost or the waveform is abnormal. | ① Use an oscilloscope to measure the drive signal waveform. Normally, it should be a square wave of about 15V. ② If the waveform is abnormal, check the drive chip (such as TA8316) and peripheral circuits. |
2. Unstable heating (fault code E4)
(1) Fault phenomenon
- The induction cooker heats intermittently and the power output is unstable.
- It may be accompanied by abnormal noise or flickering display.
(2)Fault cause and repair method
| External manifestation | Reason | Repair method |
| Temperature sensor failure | The NTC thermistor is drifting or damaged. | ① Use a multimeter to measure the resistance of the NTC thermistor (100kΩ±1% at 25℃). ② If the resistance is abnormal, replace the NTC with the same model (such as B57861S0103F040). |
| Deformation of the cable drum | The wire reel is deformed due to heat, resulting in poor contact with the pot. | ① Observe whether the wire reel is deformed and adjust it with a laser flatness detector if necessary. ② Clean the surface of the wire reel to ensure good contact with the pot. |
| Voltage fluctuations | The input voltage is unstable or the filter capacitor fails. | ① Use a capacitance meter to measure the filter capacitor (usually 450V/680μF). If the capacity deviation exceeds ±20%, it needs to be replaced. |
| Software parameters are inaccurate | PID control parameters are abnormal. | Connect the PC via the debugging interface and recalibrate the PID parameters (usually P=120, I=60, D=30). |
III Protection system failure
1. Over-temperature protection (fault code E5/E6)
(1) Fault phenomenon
- The induction cooker automatically stops after working for some time and displays the over-temperature protection code.
- It may be accompanied by an abnormal cooling fan.
(2) Fault cause and repair method
| External manifestation | Reason | Repair method |
| Poor heat dissipation | The fan is damaged or the air duct is blocked. | ① Test whether the cooling fan is operating normally. If it is damaged, replace it with a fan of the same model. ② Clean the air duct and ensure that there is no dust accumulation on the heat sink. |
| Temperature sensor failure | NTC thermistor failure | Use a multimeter to measure the resistance of the NTC thermistor. If it is abnormal, replace it. |
| Ensure enough space around the equipment for heat dissipation and install exhaust equipment if necessary. | There is insufficient ventilation around the device. | Ensure that there is enough space around the equipment for heat dissipation and install exhaust equipment if necessary. |
2. Surge protection (fault code E7/E8)
(1) Fault phenomenon
- The induction cooker suddenly stops when starting or working, and the surge protection code is displayed.
- The power indicator light may flash.
(2)Fault cause and maintenance method
| External manifestation | Reason | Repair method |
| Grid voltage fluctuations | The input voltage is too high or too low momentarily. | Use a voltmeter to monitor the input voltage to ensure it is within the normal range. |
| Surge protection component damaged | MOV varistor failure. | ① Use a multimeter to measure the resistance of the MOV. It should be infinite when it is normal. ② If it is damaged, replace it with the same model MOV. |
| Poor grounding | The equipment grounding resistance is too large. | Measure the grounding resistance and ensure that it is ≤1Ω. If necessary, reinstall the grounding device. |
IV Other common faults
1. Display screen fault
(1) Fault phenomenon
- The display screen has no display or displays incompletely.
- It may be accompanied by key failure.
(2) Fault cause and maintenance method
| External manifestation | Reason | Inspect the display for physical damage and replace it if necessary. |
| Display damage | LED or LCD screen failure. | Inspect the display for physical damage and replace if necessary. |
| Loose connection line | The display screen is poorly connected to the main control board. | Reseat the display cable to ensure good contact. |
| Main control board failure | The display driver circuit is damaged. | Measure the display drive circuit voltage. If it is abnormal, replace the main control board. |
2. Button failure
(1) Fault phenomenon:
- The key does not respond or respond slowly.
- The display may flicker.
(2) Fault cause and repair method
| External manifestation | Reason | Repair method |
| Button damage | The buttons are aging or have poor contact. | Use a multimeter to measure the continuity of the buttons. If damaged, replace them with the same model. |
| Main control board failure | The button scanning circuit is damaged. | Measure the key scanning circuit voltage. If it is abnormal, replace the main control board. |
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Комерційна індукційна плита з ручкою управління -
Цифровий екран меню комерційної індукційної плити -
Комерційний подвійний залізний вок для продажу -
Промислове індукційне автоматичне підйомне сито для макаронних виробів -
Комерційна індукційна плита Керамічна скляна нагрівальна поверхня -
Витяжний вентилятор для комерційних індукційних плит -
Плата управління комерційною індукційною плитою -
Зливний клапан для комерційних індукційних плит Запчастини для індукційних плит -
Комерційна індукційна плита мідна котушка для продажу
V. Preventive maintenance recommendations
1. Regular cleaning
Clean the heat sink and air duct every month to prevent dust accumulation.
2. Check the connection
Check the power cord and internal connection wires every quarter to ensure good contact.
3. Calibration parameters:
Calibrate the PID parameters through the debugging interface every six months to ensure stable heating performance.
4. Replace wearing parts
Check and replace wearing parts (such as fuses, filter capacitors, etc.) every year.
Conclusion
Fault diagnosis and repair of commercial induction cookers require professional knowledge and skills. Through the detailed analysis of this article, maintenance personnel can quickly locate the fault point and take effective maintenance measures. At the same time, regular maintenance and care are the buttons to extend the service life of the equipment. I hope this article can provide a practical reference for the majority of maintenance personnel.
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