Microwaves are a convenient and essential kitchen appliance in many households. However, like any appliance, they can develop issues over time. One of the most common problems is a microwave that won’t turn on. This can be incredibly frustrating, especially when you’re in a hurry. In this blog post, we will discuss the possible reasons why your microwave isn’t turning on and provide step-by-step instructions on how to fix it.
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Possible Causes and Solutions
1. Microwave Won’t Turn On: Door Switch
If your microwave oven won’t start, you may have a problem with a door switch. The door switches, often referred to as primary or secondary interlock switches, provide power to the various components in the microwave when the door is in a closed position, and interrupt power when the door is open.
How to Fix: Unplug the unit and remove the cabinet. The interlock switches will have wires attached to the terminals that are marked common (C) and normally open (NO). You can check the switches for continuity using a multimeter. With the actuator button depressed, you should see continuity between these terminals. If there is no continuity the switch will need to be replaced. You should also verify that the door hooks properly engage the switch actuator when the door is closed and adjust or replace it if necessary. Replacments can be found on Amazon here!
2. Microwave Won’t Turn On: Ceramic Fuse
If your microwave oven won’t turn on and the display is blank, the problem may be the ceramic fuse. The ceramic fuse is used to protect the components of the microwave oven if you have a severe power fluctuation or if there is a critical fault with one of the internal components.
How to Fix: The ceramic fuse is located inside of the cabinet near the entry point of the power cord. Remember to unplug the cord before attempting any repairs. You can check the fuse for continuity with a multimeter. If the fuse failed for no apparent reason, check the major components such as the magnetron, high voltage diode, capacitor and transformer, and associated wire terminals, before changing the fuse. Replacments can be found on Amazon here!
3. Microwave Won’t Turn On: Thermal Fuse or Cut Out
Microwave ovens use one or more thermal cut-outs, sometimes called thermal fuses, to protect the oven from overheating. They are located inside of the cabinet, often near the oven cavity or the magnetron.
How to Fix: Unplug the unit and remove the cabinet. Locate the thermal fuse or cut-out and remove the wires from the terminals. Check for continuity with a multimeter and replace the part if no continuity is shown. Verify that the cooling fan is functional and that the airflow is not restricted. Replacments can be found on Amazon here!
4. Microwave Won’t Turn On: Door Latch Assembly
If your microwave oven won’t turn on, you may have a problem with the door latch assembly. The door latch assembly usually consists of two hooks that protrude from the door and fit into the door switch holder that is mounted to the frame of the microwave.
How to Fix: Unplug the unit and remove the inner door panel to access the door latch. The inner panel is normally attached by plastic tangs and caution should be used to remove it. If either of the hooks is broken or does not have any spring tension, the switches may not be engaged. If this happens, the oven won’t turn on and you may need to replace the assembly. Replacments can be found on Amazon here!
Conclusion
In conclusion, if your microwave isn’t turning on, it could be due to a number of issues, from a faulty door switch to a problem with the ceramic fuse or thermal cut-out. By understanding these common problems and how to troubleshoot them, you can keep your microwave in good working order.
For more detailed instructions on how to repair or replace parts in your microwave, check out our other blog posts or contact us for professional assistance.
Note: Repairing a microwave at home can pose significant dangers if not approached with caution and expertise. Microwaves are complex appliances that operate on high voltages and contain potentially lethal electrical components. Opening up a microwave without proper knowledge and training can expose individuals to the risk of electric shock or severe burns. Additionally, microwaves emit harmful radiation, and tampering with the internal shielding can lead to exposure to dangerous levels. Moreover, improper handling or incorrect reassembly of the microwave can result in fire hazards, as microwaves generate heat to cook food.
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