When a microwave oven's fan stops working while the clock display remains lit, it's likely due to a component failure or malfunction within the microwave's internal circuitry. There are a few possible reasons for this issue:
Fan Motor Failure: The most common cause of the fan not working is a malfunctioning fan motor. Over time, the motor may wear out or develop issues that prevent it from spinning. When this happens, the cooling fan, which helps to keep the microwave's internal components from overheating, stops working.
Faulty Fan Relay or Control Board: Microwave ovens have control boards that regulate various functions, including the fan. If there's a problem with the fan relay or the control board itself, it can lead to the fan not turning on even if it's in good physical condition.
Thermal Fuse Failure: Microwave ovens have thermal fuses that act as safety devices to protect against overheating. If the microwave overheats for any reason, the thermal fuse can blow, cutting off power to the fan and other components. In such cases, the clock display may still receive power, but the fan won't work until the thermal fuse is replaced.
Loose Wiring or Connections: Over time, vibrations from the microwave's operation can lead to loose wiring or connections, which can interrupt power to the fan motor.
Motor Overload: Continuous heavy usage or exposure to extremely high temperatures can cause the motor to overload and fail.
To resolve this issue, you should first unplug the microwave from the power source for safety purposes. Then, you have a few options:
DIY Troubleshooting: If you're familiar with electrical components and safety precautions, you can try inspecting the internal components, such as the fan motor, control board, and wiring, for any visible signs of damage or loose connections.
Professional Repair: It's often safer and more effective to seek the help of a qualified technician or the manufacturer's service center to diagnose and fix the issue. They have the necessary expertise and tools to handle microwave repairs safely.
In any case, it's essential to avoid using the microwave until the issue is resolved to prevent any potential damage or safety hazards. Microwaves are complex electrical appliances, and tampering with them without proper knowledge can be dangerous. Always prioritize safety and seek professional assistance if needed.