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RCA Microwave not working

If your RCA microwave is not working, start with the line fuse, the most likely cause when the microwave is completely dead or the microwave has power but is not working. Test the fuse for continuity with a multimeter and replace it only after addressing the electrical problem that caused it to blow. Next, inspect the switch holder behind the control panel. A damaged or misaligned holder may prevent the primary, secondary, or monitor door switch from engaging when the door closes. If those parts check out, the main control board could be defective, although it is less common and often misdiagnosed. An open thermostat, a dead electrical outlet, or a blown thermal fuse can also stop an RCA microwave from starting. Test the outlet with another appliance, then check the thermostat and thermal fuse for continuity. Any repair that requires removing the outer cabinet, including replacing a line fuse, thermal fuse, or control board, exposes you to a high-voltage capacitor that can store lethal charge even after the microwave is unplugged. The capacitor must be properly discharged before interior work, so use a qualified technician if you are not familiar with that procedure. Enter your model number to find the exact replacement part for your RCA microwave.

01 - RCA Microwave Line Fuse

If too much current passes through the microwave circuitry, the line fuse will blow. If the line fuse blows, the microwave won’t start. To determine if the line fuse is at fault, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. In addition, you should investigate and resolve the problem that caused the fuse to blow. If you don’t resolve the underlying issue, the new fuse will blow too. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, i...t is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the line fuse.)
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02 - RCA Microwave Switch Holder

The microwave switch holder is the component that houses the door switches behind the control panel. If the switch holder is damaged or misaligned, one of more switches may not be actuated when the microwave door is closed, resulting in the microwave not working. You will need to uninstall the control panel and inspect the switch holder to confirm it is in good condition and secured properly. Replace the switch holder with a new one if necessary.
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03 - RCA Microwave Main Control Board

The main control board might be defective. However, this is rarely the case. Control boards are often misdiagnosed—check all of the more commonly defective parts. If you have determined that all of the other components are working properly,replace the main control board. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the main control board.)
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04 - RCA Microwave Thermostat

If the microwave overheats, the thermostat trips to cut off voltage to the microwave. If the thermostat is shorted open, it may not allow voltage to reach the high voltage components. To determine if the thermostat is at fault, use a multimeter to test it for electrical continuity. If the thermostat does not have continuity, and it cannot be reset, replace it.
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Highly Likely

05 - Incoming Power Problem

The electrical outlet may not be getting power. To determine if the outlet is getting power, try plugging something else into the outlet. If the outlet is not getting power, check the home circuit breakers or fuses.
Highly Likely

06 - RCA Microwave Thermal Fuse

The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. The thermal fuse cannot be reset—if the fuse is blown, it must be replaced. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the thermal fuse.)
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Common

07 - RCA Microwave Control Board

Since the control board controls the voltage being sent to all of the microwave's components, a defective board could be responsible for a microwave not working. However, this is rarely the case. Control boards are often misdiagnosed—check all of the more commonly defective parts. If you have determined that all of the other components are working properly, replace the control board.
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Common

Frequently Asked Questions

Why is my RCA microwave not working but has power?
Where is the microwave fuse, and how do I replace it?
Can a door switch or switch holder cause an RCA microwave to stop working?
Why did my RCA microwave suddenly stop working after overheating?
How do I find the correct RCA microwave replacement part?