Frigidaire Microwave is Not Heating [How to Fix]

This problem is a known thing among Frigidaire microwave users. If your Frigidaire microwave is not heating, you are probably wondering how to fix it. So in this article, we are going talk about the causes of this problem and what to do about it.

Why Won’t My Frigidaire Microwave Heat

There are a couple of reason why your Frigidaire microwave is not heating, so, we are going to cover them one at a time.

The Line Fuse

To replace the fuse in a Frigidaire microwave, follow these steps…

Step 1: First, ensure that the microwave is turned off and unplugged.

Step 2: Open the microwave door and take out the two screws on top of the front vent using a screwdriver. There will be one screw on the right, and one on the left.

Step 3: Pry out the vent using a putty knife.

Step 4: Take out the screw that secures the control panel and gently lift the panel out.

Step 5: Disconnect all the wires connected to the control board and make sure to note where each one goes. You can take a picture so that you can reconnect the wires in the right places later on.

Step 6: Take out the screw to be able to remove the access grille.

Step 7: Remove the grille.

Step 8: Take out the fuse (you can do this using a screwdriver).

Step 9: If the fuse seems to be a bit melted or if it smells burnt, you will need to replace it.

Step 10: Get a new fuse and install it.

Step 11: Screw the grille back.

Step 12: Reconnect all the wires to the control board.

Step 13: Align the control panel and push back into place.

Step 14: Screw it back tightly (this step will be a lot easier if you use a magnetized screwdriver).

Step 15: Realign the front vent and return the two screws.

Step 16: Close the door and plug the microwave back.

Step 17: Place a cup of water in the microwave and set it to high.

Step 18: Microwave the water for one minute.

Step 19: After one minute, take out the water. If the water is hot, you have fixed the problem, if not, read on.

Note: The fuse is one of the possible reasons your Frigidaire microwave is not heating. If the fuse has blown, the microwave won’t heat.

Watch the video below for a visual of how to replace a Frigidaire microwave line fuse.

The Diode

To replace the diode in a Frigidaire microwave, do the following…

Step 1: Turn off the microwave and make sure to unplug.

Step 2: Remove the glass tray and support in the microwave.

Step 3: Have a second person hold the bottom of the microwave as you loosen the screws that secure it to the cabinet.

Step 4: Use a screwdriver to remove the three screws on the cabinet.

Step 5: Tilt the microwave down carefully and pull the power cord through the cabinet hole.

Step 6: Lift the microwave out and set on its back on a sturdy surface covered with a cloth or towel.

Step 7: Take out the screws holding the microwave’s bottom panel in place.

Step 8: Disconnect the light wire connector from the panel to fully remove it.

Step 9: Place the microwave back on its bottom and use a piece of wood or something else to prop the front.

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Step 10: Open the microwave door and take out the two screws that secure the front vent.

Step 11: Gently pry out the vent using a putty knife.

Step 12: Take out all the screws that hold the microwave cover in place.

Step 13: Also remove the two screws that secure the blower assembly cover.

Step 14: Slide the cover out to remove.

Step 15: Remove the microwave cover.

Step 16: Before going any further, discharge the power in the capacitor. Do this by placing needle nose pliers across each terminal.

Step 17: Remove the screw that secures the diode wire to the frame.

Step 18: Using the needle nose pliers, detach the diode.

Step 19: Install the new diode by attaching it to the capacitor terminal and screwing it into place tighly.

Step 20: Position the microwave cover back and return all the screws.

Step 21: Slide the blower cover back screw back tightly with the three screws.

Step 22: Push the front vent back and return the two screws.

Step 23: Lay the microwave on its back and connect the light wire back to the bottom panel.

Step 24: Screw the bottom panel back into place.

Step 25: Position the microwave back on the mounting plate and take the microwave’s power cord through the hole in the cabinet.

Step 26: Screw back to the cabinet with the three screws you removed before.

Step 27: Place the turntable support and glass tray back into the microwave.

Step 28: Plug it back and microwave a cup of water on high for one minute to test whether it works well now. If after this your Frigidaire microwave is not heating, keep reading.

The video below will show you how to replace the diode in a Frigidaire microwave.

The Door Switch

To replace the door switch in a Frigidaire microwave, do the following…

Step 1: Before starting, make sure to turn off the microwave and unplug.

Step 2: Take out the six screws at the microwave rear.

Step 3: Also take out the screw on the right side of the microwave then remove the microwave cover.

Step 4: You will need to discharge the capacitor to prevent the risk of injury. To discharge the capacitor, place needle nose pliers across each terminal on the capacitor.

Step 5: Use a screwdriver to remove the screw that holds the control panel in place.

Step 6: Open the microwave door and lift up the control panel to detach.

Step 7: Take a picture of the control panel to remember where each wire goes then disconnect the wires on the control board.

Step 8: Take out the two screws that secure the door latch bracket.

Step 9: Push the door latch bracket down to release.

Step 10: Note where each door switch goes then disconnect them from the bracket.

Step 11: To test whether the door switches are bad or not, click the small button on each one. If you hear a strong click, the switch is good. If the button feels loose when you press it, the door switch needs to be replaced.

Step 12: Disconnect the wires from the bad switch or switches and connect the wires to the new door switch or switches.

Step 13: Snap the door switches back into the bracket and screw the bracket into place with the two screws.

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Step 14: Reconnect the wires to the right places on the control board.

Step 15: Insert the control panel’s lower tabs into the frame slots then screw it back tightly.

Step 16: Place the microwave cover back and screw back tightly.

Step 17: Plug the microwave and do the water test. If your Frigidaire microwave is not heating still, keep reading.

The video below is to give you a visual of how to replace a Frigidaire microwave door switch.

The Capacitor

To test and replace the capacitor in a Frigidaire microwave, do the following…

Step 1: Unplug the microwave from the outlet.

Step 2: Before beginning the repair, you will need to uninstall the microwave from the cabinet. Take out the glass tray and support from the microwave.

Step 3: Open the cabinet door and take out the bolts which secure the microwave to it. Have someone support the microwave as you do this.

Step 4: Tilt the microwave forward and pass the power cord through the hole in the cabinet.

Step 3: Lift the microwave off of the mounting plate on the wall.

Step 4: Place the microwave on a flat and sturdy surface lined with a towel.

Step 5: Take out the screws at the top of the microwave front grille.

Step 6: Pull the front grille out.

Step 7: Lay the microwave on its back and take out all the screws which secure the bottom panel.

Step 8: Disconnect the wire connector to fully remove the bottom panel.

Step 9: Turn the microwave back to its normal position and prop the front up with a thick plank.

Step 10: Take out the screws at the top of the microwave which secure the blower cover.

Step 11: Remove the blower cover.

Step 12: Take out all the screws at the top, back, and sides of the microwave to remove its cover.

Step 12: Remove the microwave cover.

Step 13: Next, you will need to discharge the capacitor. Do this by placing a pair of pliers over the terminals of the capacitor at the same time.

Step 14: Disconnect the wires connected to the capacitor making sure to note where each one goes first.

Step 15: Take out the screws which hold the capacitor in place.

Step 16: Take the capacitor out.

Step 17: Test the capacitor with a multimeter. If there is no continuity get a new capacitor. If you do not know how to test a capacitor using a multimeter, read this

Step 18: Transfer the bracket from the old capacitor to the new one.

Step 19: Position the capacitor and screw it into place.

Step 20: Reconnect all the wires to the right terminals of the capacitor.

Step 21: Return the microwave cover and hold in place with the screws.

Step 22: Align the blower cover and secure it with the screws.

Step 23: Rest the microwave on its back once again and return the bottom panel.

Step 24: Reconnect the wire connector and screw the bottom panel in place.

Step 25: Turn the microwave back to its upright position.

Step 26: Before returning the front grille, ensure that the charcoal filter is properly seated.

Step 27: Return the front grille and hold it in place with the screws.

Step 28: Sit the microwave on mounting plate.

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Step 29: Pass the power cord through the opening of the cabinet.

Step 30: Secure the microwave to the cabinet with the bolts.

Step 31: Return the glass tray and support.

Step 32: Plug the microwave back in.

The video below will walk you through how to replace the capacitor in a Frigidaire microwave.

The Magnetron

To test and replace the magnetron in a Frigidaire microwave, follow the steps listed below…

Step 1: Turn off and unplug the microwave from the power source.

Step 2: Take out the glass tray and support from within the microwave.

Step 3: If your microwave is installed to the cabinet, you will need to uninstall it. Take out the bolts which secure the microwave to the cabinet.

Step 4: Tip the microwave forward a bit and pass the power cord through the hole in the cabinet.

Step 5: Lift the microwave up from the mounting plate and place on a towel lined sturdy surface with the back downwards.

Step 6: Take out all the screws which hold the bottom panel of the microwave in place.

Step 7: Disconnect the wire connector and remove the bottom panel.

Step 8: Turn the microwave back to its upright position and prop the front up with something thick.

Step 9: Take out the screws at the top of the front grille.

Step 10: open the door of the microwave to remove the front grill.

Step 11: Take out the screws at the top of the microwave securing the blower cover.

Step 12: Remove the blower cover.

Step 13: Take out the screws at the back, top, and sides of the microwave which hold its cover in place.

Step 14: Remove the microwave cover.

Step 15: Discharge the capacitor. Do this by placing a pair of needle nose pliers on the terminals of the capacitor simultaneously.

Step 16: Take out the screw which secures the thermostat plate t the magnetron.

Step 17: Note where each wire goes on the capacitor then disconnect them.

Step 18: Take out the screws securing the capacitor.

Step 19: Disconnect the wire connector connected to the magnetron.

Step 20: Unthread the screw in order to bend the air diverter flap back.

Step 21: Tighten the screw to hold the flap in place.

Step 22: Take out the screws which hold the magnetron in place.

Step 23: Take out the magnetron.

Step 24: Test the microwave magnetron using a multimeter. If there is no continuity, get a new magnetron. To know how to test a magnetron using a multimeter, click here

Step 25: Get a new magnetron and screw it into place.

Step 26: Unthread the screw to reposition the air diverter flap.

Step 27: Tighten the screw again.

Step 28: Reconnect the wire connector.

Step 29: Return the capacitor and secure with the screws.

Step 30: Reconnect the wires to the appropriate terminals of the capacitor.

Step 31: Align the thermostat plate back on the magnetron and secure with the screws.

Step 32: Reposition the microwave cover and return the screws at the back, top, and sides of the microwave to secure.

Step 33: Return the blower cover and hold in place with the screws.

Step 34: Return the front grille and the screws at the top.

Step 35: Close the microwave door and rest the microwave on its back again.

Step 36: Reconnect the wire connector to the bottom panel and screw it in place.

Step 37: Sit the microwave back on the mounting plate and pas the power cord through the hole in the cabinet.

Step 38: Secure the microwave to the cabinet with the bolts.

Step 39: Return the glass tray and support.

Step 40: Plug the microwave back in.

The video below will walk you through the process of replacing a Frigidaire microwave magnetron.

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