Frigidaire Microwave Not Heating? Easy Fixes You Can Try

 



Microwaves are indispensable kitchen appliances, offering quick solutions for heating meals. However, if your Frigidaire microwave stops heating, it can cause significant frustration. Before you consider purchasing a new unit or calling a repair technician, there are several simple fixes you can attempt by inspecting and replacing certain Frigidaire microwave parts. In this article, we will explore common causes of a Frigidaire microwave not heating and guide you through easy troubleshooting methods to restore the appliance’s functionality.

Common Causes and Fixes for a Frigidaire Microwave Not Heating

There are several possible causes for your Frigidaire microwave not to heat up. Let's look at some of the most common causes and potential fixes.

1. Blown Fuse

A blown fuse is often the most common reason your Frigidaire microwave isn't heating. The fuse protects the appliance from power surges, and when it blows, the microwave won’t be able to operate.

Fix:

  • Take the microwave unplugged and open the casing (wear protective gloves and safety glasses).

  • Check the fuse near the control board or magnetron.

  • Use a multimeter to check for continuity. Replace the fuse with a new one of the same rating if it has blown. This is an easy fix and a great first step in troubleshooting.

2. Faulty Magnetron

The magnetron is a critical Frigidaire microwave part that is responsible for generating the electromagnetic waves that heat your food. If the magnetron is malfunctioning, the microwave won't heat up.

Fix:

  • Unplug the microwave and let the capacitor discharge.

  • To verify the continuity of the magnetron, use a multimeter. If the magnetron is bad, it will have to be replaced.

  • It can be a bit complex to replace the magnetron, so if you don’t feel comfortable with this repair, you may want to have a professional take a look at it.

3. Malfunctioning Door Switches

If the door switches in your microwave are broken, the microwave might not heat. These switches make sure the microwave only turns on when the door is shut all the way.

Fix:

  • Open the microwave and press the door latch to check for any issues with the switches. Listen for a clicking sound, which indicates the switch is working properly.

  • To make sure the door switches are working, test them using a multimeter. A switch should be replaced if it is defective.

4. Defective High Voltage Diode

Electrical power is transformed into microwave radiation by the high-voltage diode. If the diode is defective, the microwave will fail to produce heat.

Fix:

  • Disconnect the microwave and let the capacitor run out.

  • Use a multimeter to test the diode. If there is no continuity, it will need to be altered.

  • Replacing a faulty diode can be tricky, so if you’re unsure, it’s best to call a technician for help.

5. Damaged Capacitor

The capacitor stores and transfers electrical energy to the magnetron. If the capacitor is damaged, the microwave will not be able to generate heat.

Fix:

  • Before you do anything, discharge the capacitor to avoid any electrical shocks.

  • Test the capacitor with a multimeter. If the capacitor shows no continuity or an open circuit, it is probably defective and should be replaced.

  • Capacitors store energy even when unplugged, so be careful when working with them.

6. Microwave Control Board Issues

The control board is your microwave's brain, managing every aspect of operation, including heating. If the control board is malfunctioning, your microwave may fail to heat properly.

Fix:

  • If you’ve tested the magnetron, fuse, and other parts but still haven’t solved the problem, the control board might be the issue.

  • Control board issues might be difficult to diagnose. For an accurate diagnosis and repair, it is advisable to speak with a qualified expert if you are unsure.


If your Frigidaire microwave isn’t heating, troubleshooting and replacing specific components can often resolve the issue. If the problem persists or you're unsure how to repair it, it's best to consult a trained professional. Maintaining your microwave regularly will also guarantee that it keeps working well for many years.

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