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RCA Microwave turns on by itself

An RCA microwave turning on by itself can result from a defective main control board, especially when the touchpad works normally. On an over-the-range model, however, the vent fan may turn on automatically while stovetop cooking to cool the microwave, then shut off after the unit cools. If the microwave actually starts cooking, or the microwave turns on when the door opens or closes, test the interlock switch with a multimeter. A damaged or misaligned switch holder can prevent the door switches from engaging correctly and may also cause this problem. Less common causes include intermittent contact between circuits in the touchpad and control panel, or a faulty touchpad. Before replacing parts, note whether only the fan runs or the microwave begins heating. Enter your model number to find the exact RCA replacement part for your microwave. Any repair that requires removing the outer cabinet must be handled carefully because the high-voltage capacitor stores a lethal charge even after the microwave is unplugged. It must be properly discharged before interior work begins, and readers unfamiliar with capacitor discharge procedures should have a qualified technician perform the repair.

01 - RCA Microwave Main Control Board

First, make sure that the touchpad is working properly. If the touchpad is working properly, the main control board is likely at fault. If the control board is defective, replace it.
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Top Solution

02 - Microwave cooling down during stovetop cooking

Most over-the-range microwaves have a vent fan thermostat that will turn the vent fan on automatically to keep the microwave from overheating. The fan will shut off after the microwave cools back down.
Highly Likely

03 - RCA Microwave Interlock Switch

A microwave that turns on by itself can be caused by a malfunctioning interlock switch. You can use a multimeter to test the interlock switches to determine if they are functioning appropriately and replace if necessary.
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Common

04 - 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, the switches may not be properly engaged which could cause the microwave to turn on by itself. 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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Common

05 - RCA Microwave Touchpad and Control Panel

It’s possible that the touchpad and control panel button circuits are coming into contact with each other intermittently which could cause the microwave to turn on by itself. If this happens, the touchpad and control panel will need to be replaced.
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Less Common

06 - RCA Microwave Touchpad

It’s possible that the touchpad button circuits are coming into contact with each other intermittently which could cause the microwave to turn on by itself. If this happens, the touchpad will need to be replaced.
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Less Common

Frequently Asked Questions

Why does my RCA over-the-range microwave fan turn on by itself?
Can an RCA microwave turn on by itself when the door is open?
What causes an RCA microwave to start by itself or keep running?
How do I know whether the RCA microwave interlock switch or touchpad is bad?
How can I find the correct RCA microwave switch, touchpad, or control board replacement?

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