Kitchenaid Microwave is Not Heating [How to Fix]

KitchenAid RKCO253GC 12 Inch Counter Top Oven Gloss Cinnamon - (Renewed)

When a Kitchenaid microwave is not heating, there could be many causes. it could be the diode, door switch, fuse, or magnetron. So in this article we are going to talk about each component and how to replace them.

Why Isn’t My Microwave Heating Up?

There are a couple of reasons your Kitchenaid microwave is not heating. If your Kitchenaid microwave is not heating, it could be because of the fuse, diode, door switches, capacitor, or magnetron. To fix the problem, you will need to check and maybe replace these components.

The Fuse

To check and replace the fuse in a Kitchenaid microwave, follow these steps…

Step 1: Begin by turning the microwave off and unplugging.

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

Step 3: Take out the two screws on the two sides of the microwave that secure it to the cabinet.

Step 4: Lift the microwave out of the cabinet and place on a sturdy surface.

Step 5: Using a screwdriver, take out the four screws on the top panel of the microwave.

Step 6: Slide the panel forward to remove.

Step 7: Take the old fuse from the holder and use a mulitmeter to test for continuity. If the fuse has no continuity, it needs to be replaced.

Step 8: Get a new fuse and place in the holder.

Step 9: Place the top panel back and screw tightly using the four screws.

Step 10: Push the microwave back into the cabinet.

Step 11: Secure the microwave to the cabinet using the two screws you removed earlier on.

Step 12: Place the rack, glass tray, and support back into the microwave.

Step 13: Plug the microwave in.

Step 14: Place one cup of water in the microwave for one minute on the highest setting. If the Kitchenaid microwave is not heating up the water, you may need to replace one of the other components.

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The video below will show you how to replace the line fuse in a Kitchenaid microwave.

The Door Switch

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

Step 1: Turn the microwave off and unplug.

Step 2: Take out the screws on the sides of the microwave that secure it to the cabinet, then remove the rack glass tray and support.

Step 3: Lift the microwave out of the cabinet and place on a flat and sturdy surface.

Step 4: Use a screwdriver to remove the four screws on the top panel of the microwave (there will be two on each side).

Step 5: Slide the panel out.

Step 6: Take out all the screws on the left and right panel of the microwave.

Step 7: Remove the panels.

Step 8: First, go to the right side of the microwave and remove the door switch from the holder.

Step 9: Press the small button on the door switch to find out if it is faulty or not. If you hear a strong click, the switch is still good. Place it back in the holder and go to the left side of the microwave to check the other switch. However, if the button is loose, you will need to replace it.

Step 10: Disconnect the wires from the bad door switch and get a new one.

Step 11: Connect the wires to the new door switch and place it in the holder

Step 12: Place the panel back and screw tightly with the screws.

Step 13: Do the same with the other side.

Step 14: Slide the top panel back in and secure using the four screws.

Step 15: Push the microwave back into the cabinet.

Step 16: Screw the sides of the microwave to the cabinet.

Step 17: Return the rack, glass tray, and support to the microwave.

Step 18: Do the water test. If your Kitchenaid microwave is not heating still keep reading.

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The video below will show you how to replace the door switch in a Kitchenaid microwave.

The Capacitor

To test and replace the capacitor in a Kitchenaid microwave, follow these steps…

Step 1: Unplug the oven.

Step 2: Open the door of the oven and take out the glass tray as well as the support.

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

Step 4: Pass the microwave’s power cord through the hole in the top cabinet.

Step 5: Lift the microwave off the bracket on the wall and set it on a cloth lined sturdy surface.

Step 6: Take out the screws which hold the front grille of the microwave in place.

Step 7: Now remove the front grille. You might need to open the oven door to do this.

Step 8: Rest the microwave on its back.

Step 9: Take out the screws which hold the bottom panel of the oven in place using a screwdriver.

Step 10: Disconnect the wire harness on the right side.

Step 11: Also disconnect the wires connected to the turntable motor. Make sure to note where each wire goes.

Step 12: Now remove the bottom panel of the microwave and set it aside.

Step 13: Turn the microwave back to its usual position.

Step 14: Take out the screws which secure the blower cover.

Step 15: Remove the blower cover and set it aside.

Step 16: Take out all the screws which hold the microwave cover in place. There will be some screws at the back, top, and maybe the sides.

Step 17: Remove the microwave cover.

Step 18: Place a screwdriver with an insulated handle across the terminals of the capacitor.

Step 19: Take out the screws which secure the inner access panel in front of the capacitor.

Step 20: Disconnect the wires connected to the capacitor.

Step 21: Take out the screws which secure the capacitor.

Step 22: Remove the capacitor and test it using a multimeter. If there is no continuity, get a new capacitor.

Step 23: Position the new capacitor in the microwave and hold it in place with the screws.

Step 24: Reconnect the wires to the capacitor.

Step 25: Return the inner access panel and the screws which secure it.

Step 26: Reposition the microwave cover.

Step 27: Hold the microwave cover in place using the screws.

Step 28: Return the blower cover and secure it with the screws.

Step 29: Rest the microwave on its back and return the bottom panel.

Step 30: Reconnect the wire harness at the right side.

Step 31: Reconnect the turntable motor wires making sure to connect them to the right terminals.

Step 32: Screw the bottom panel back into place.

Step 33: Turn the microwave back up.

Step 34: Return the front grille and the screws which secure it.

Step 35: Lift the microwave up and sit it on the mounting bracket.

Step 36: Pass the power cord through the hole in the cabinet.

Step 37: Secure the microwave to the cabinet using the screws.

Step 38: Return the glass tray and support to the microwave.

Step 39: Close the microwave door.

Step 40: Plug the microwave back in.

Keep reading if your Kitchenaid microwave is not heating still.

Watch the video below for a visual of how to replace the capacitor in a microwave.

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The Magnetron

If your Kitchenaid microwave is not heating, you may need to replace the magnetron. Before you go to replace the magnetron, you should first ensure that this is the component you need to replace.

Since the magnetron is almost as expensive as a microwave, it would be a waste to replace it and discover that it wasn’t actually faulty.

Replacing a magnetron is also very complicated. So, to be on the safe side, you can get an experienced technician to determine and fix the problem. However, if you are experienced in microwaves, you can replace the magnetron.

To replace the magnetron in a Kitchenaid microwave, do the following…

Step 1: Turn off the microwave and unplug.

Step 2: Open the microwave door and take out the rack, glass tray and support.

Step 3: Using a Philips head screwdriver, take out the two screws on the sides of the microwave that secure it to the cabinet.

Step 4: Pull the microwave out of the cabinet and place on a flat and sturdy surface.

Step 5: Take out the four screws securing the top panel of the microwave (there will be two screws on each side).

Step 6: Remove the panel.

Step 7: Use a putty knife or flathead screwdriver to release the tabs of the inverter board cover.

Step 8: Take out the screw behind the inverter board cover to fully remove it.

Step 9: Take out all the screws on the right side panel that hold it in place.

Step 10: Remove the panel.

Step 11: Use a screwdriver to remove the four screws on the magnetron.

Step 12: To be able to remove the magnetron, you have to detach the cavity vent assembly. To do this, release the main control board by pushing the tabs back.

Step 13: Detach the spring and lift the light bulb out.

Step 14: Take out the screws holding the power supply board plate in place.

Step 15: Move both the plate and power supply board aside.

Step 16: Disconnect the wire from the user interface board.

Step 17: Rotate the vent ampere actuator to release from the vent assembly.

Step 18: Now take out the screws that hold the cavity vent assembly in place.

Step 19: Take out the assembly and set aside.

Step 20: Unplug the wire connector connected to the magnetron.

Step 21: Disconnect the magnetron and turn it over.

Step 22: Note where the sensor wire goes, then take out the screw that holds it in place. Test the magnetron using a multimeter. If you do not know how to do this, click here

Step 23: Get a new magnetron and connect the sensor wire to it using the screw.

Step 24: Turn the magnetron over and insert it into the waveguide.

Step 25: Return the four screws and tighten them to secure the magnetron.

Step 26: Position the sensor wire under the vent cover.

Step 27: Plug the wire connector back to the magnetron.

Step 28: Reposition the cavity vent assembly in place.

Step 29: To secure, screw back tightly using the screws you removed earlier on.

Step 30: Ensure that the switch wires are in the notch of the vent assembly.

Step 31: Reinsert the actuator into the vent assembly and turn in the opposite direction to lock.

Step 32: Plug the wire back to the user interface board.

Step 33: Align the power supply board plate and hold in place with the screws.

Step 34: Push the light bulb back into the hole and secure with the springs.

Step 35: Secure the main control board under the tabs.

Step 36: Align the side panel and return the screws.

Step 37: Position the vent cover and snap it into place.

Step 38: Insert the metal retainer through the slot on the panel and screw tightly.

Step 39: Place the top panel back and secure with the four screws.

Step 40: Push the microwave into the cabinet and secure the sides with the washers and screws.

Step 41: Return the turntable support, glass tray and rack into the microwave.

If your Kitchenaid microwave is not heating, you should call a technician to determine what the problem is.

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The video below will walk you through how to replace a Kitchenaid microwave magnetron.

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