Induction cooker fault codes E01, E02, E03 indicate that the thermistor in the temperature detection circuit of the cooker, that is, the main sensor under the ceramic panel has a short circuit or open circuit, and the zero crossing detection circuit, so that the fault range can be located in the temperature detection circuit of the cooker, the main control IC and the zero crossing detection circuit.
Midea induction cooker fault code E01, E02, E03 Fault judgment maintenance:
1. When E01 appears, it is necessary to determine whether it is a pan temperature detection circuit or a zero-crossing detection circuit. Use a multimeter to measure the 17th pin of the main chip. Normally, the voltage is 0.54V. If the voltage is abnormal, it indicates that there is a problem with the zero-crossing detection circuit. If the voltage is normal, it means that the boiler temperature detection circuit is faulty.
2. Maintenance process of boiler temperature detection circuit. Disconnect the power supply and remove the thermistor terminal from the circuit board. Measure the resistance at both ends of the thermistor using the 200m resistance level of the multimeter. Because the thermistor is made of a negative temperature coefficient material, its resistance value will continuously decrease or increase as the temperature increases or decreases. When the thermistor is heated with an electric soldering iron, its resistance value changes when the resistance is measured with a multimeter. If the resistance value of the thermistor cannot be measured or the resistance value is unchanged when heated, it indicates that the thermistor is broken, short-circuiting or qualitative change occurs inside. Replace with a new thermistor of the same specification, troubleshooting.
3. When the thermistor measured in the above detection is good, it indicates that the problem of the thermistor itself can be eliminated, so we should put the fault in the post-stage circuit to find out. The specific search is as follows: Generally, when this fault occurs, the voltage of the 25th pin of the main control IC is basically close to 5V or 0V, then we can first measure the voltage of the 25th pin of the IC to determine whether the fault is in the main control ic or in the peripheral circuit. The normal value of pin 25 at normal temperature is 0.6V, if the measured voltage is 0.6V, it indicates that the temperature detection circuit of the previous stage is normal, and the problem occurs in the main control ic. If the 25th pin voltage measured is not 0.6v, at this time you can use a multimeter to measure whether the three components of the resistance R6, C5, R17 are intact, and replace the faulty component with a new one; If the components are normal, you can judge that the main control ic is faulty, and replace the chip of the same model to eliminate the fault.
4. Zero crossing inspection circuit maintenance process. The 17th pin voltage of the main chip is not 0.45V, you can use a multimeter to measure whether the Q4 base has how much V voltage, if there is this voltage, you can use a multimeter to measure whether Q4, R70, C11 is normal, and the main chip can be replaced if the component is normal. If the voltage is not present, check whether D301, D300, R308, and C40 are normal