LG Microwave Repair Case: The microwave stops working after operating for 5 to 15 minutes.
**Fault Symptoms:** The microwave operates for 5 to 15 minutes and then stops. After 15 to 20 minutes, it can be restarted, but again stops after 5 to 15 minutes of operation.
**Analysis and Repair:** When the microwave starts working and stops after a period of time, this indicates that there is no fault in power output. The problem may be caused by either the fan motor not running or a damaged temperature relay. First, check the power supply to the relay and the fan motor. If the power supply is normal and the temperature relay also functions properly, use a multimeter to measure the DC resistance of the fan motor winding. If the resistance is infinitely high, it indicates that the fan motor winding is open-circuited, causing the motor to stop rotating. This results in uneven and rapid temperature increases inside the oven, triggering the relay to cut off the power supply, thus stopping the microwave. After replacing the fan motor, the microwave returns to normal use.
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