What Causes A Microwave Not To Heat
Microwave Not Heating
Microwaves are a staple in most kitchens, providing a quick and convenient way to heat food. However, like any appliance, they can develop issues over time. One of the most common problems is a microwave that won’t heat. 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 heating and provide step-by-step instructions on how to fix it.
If you need to test an electrical component when making your repairs, more often than not, you will need a multimeter. You can pick one up over on Amazon Here!
Possible Causes and Solutions
Microwave Not Heating: 1. High-Voltage Diode
The high-voltage diode is a component that helps channel and provide electricity to the magnetron, which is responsible for generating the microwaves that heat your food. If the diode is burned out, the microwave won’t generate power to spin the magnetron and heat the food.
How to Fix: You can remove the front cabinet panel using a Phillips-head screwdriver (after first unplugging the microwave) and check the polarity of the diode using a multimeter. It should show low resistance in one direction and high resistance in the other. If not, or if it shows continuity on both ends, then the high-voltage diode needs to be replaced. Replacments can be found on Amazon here!
Microwave Not Heating: 2. Door Switch
A microwave won’t heat until the door is in a closed position. If the door switch on your microwave fails to lock properly, especially when the door is slammed frequently, it can prevent the microwave from heating.
How to Fix: You can check for this issue by unplugging the unit, unthreading the exterior screws and removing the outer cabinet housing, and using a multimeter to check whether there is any power coming through the switches. If your microwave has a button to release the door, press it down while checking the door switches. If the terminals of the microwave read zero, they have continuity. If not, the switches will need to be replaced. Replacments can be found on Amazon here!
Microwave Not Heating: 3. Magnetron
The magnetron is the component that generates the heat for the microwave. When a magnetron fails, it can also blow fuses, which can cause other failures in the microwave.
How to Fix: You can check to see if the magnetron is working by unplugging the unit, removing the cabinet housing, safely discharging the high-voltage capacitor, and removing the magnetron. With your multimeter, you can check the charge from the terminals. They should read 2 to 3 ohms of resistance if the magnetron is still working. Then, use one probe to touch the metal housing that encloses the magnetron; if it reads zero, there’s a problem.
Note: It’s recommended that a professional replace a faulty magnetron due to the dangerous nature of high-voltage repairs. You can also leave the diagnostics of the magnetron to a professional if you prefer. Depending on how old your microwave is, it’s worth considering replacing the unit completely if the magnetron has gone out.
Microwave Not Heating: 4. User Error
Sometimes, the issue could be as simple as a user error. For instance, the delay timer might have been set to begin cooking at a later time, or you might be trying to heat up very dry or fat-free foods, which microwaves struggle to heat.
How to Fix: Check to see if the delay timer was set to begin cooking at a later time. You can always unplug the microwave for a moment to reset the system if the timer doesn’t cancel easily. Also, ensure that you’re not trying to heat up very dry or fat-free foods.
Microwave Not Heating: Help From Yorkshire Appliances
In conclusion, if your microwave isn’t heating, it could be due to a number of issues, from a faulty high-voltage diode to a problem with the door switch or magnetron. 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: Always remember to disconnect the power before attempting any repairs or maintenance on your appliances. If you’re unsure about any of the steps outlined above, it’s best to seek professional help.
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