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HomeRepair HelpFrigidaire Microwave RepairFrigidaire Microwave is tripping circuit breaker Repair
Frigidaire Microwave is tripping circuit breaker
When a Frigidaire microwave is tripping the breaker, especially when you close the door or start a cycle, a defective door switch is the most likely cause. Most microwaves use three or four switches, including the primary door switch, secondary door switch, and monitor switch, which must actuate in sequence. A failed switch can short the circuit, blow the line fuse, or cause the microwave to keep tripping the breaker. If the door switches test good for continuity, a shorted high-voltage capacitor is the next likely cause. Less common possibilities include a shorted magnetron or high-voltage transformer. A failing transformer may also arc or produce a burnt smell. Any repair that requires opening the outer cabinet involves serious shock risk because the high-voltage capacitor can store thousands of volts, even after the microwave is unplugged. The capacitor must be properly discharged before interior work, and repairs involving the door switches or high-voltage system may require a qualified technician if you are not familiar with safe discharge procedures. Enter your Frigidaire microwave model number to find the exact replacement door switch, capacitor, magnetron, or transformer for your specific appliance.
01 - Frigidaire Microwave Door Switch
Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If any of the door switches fail, the microwave line fuse can blow, or the circuit breaker may trip. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches lack continuity, replace the defective switch. (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 potenti...
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02 - Frigidaire Microwave High Voltage Capacitor
A microwave that is tripping a circuit breaker can be caused by a shorted high voltage capacitor. You can determine that a capacitor has shorted by contacting one multimeter lead to one of the capacitor's terminals and the other lead to the casing. If meter display indicates that electrical continuity is present between any of the capacitor terminals and the casing, or the terminals show continuous continuity between them, the component has shorted and will need to be replaced.
Uncommon But Possible
03 - Frigidaire Microwave Magnetron
A microwave that is tripping a circuit breaker can be caused by a shorted magnetron. You can determine that a magnetron has shorted by contacting one multimeter lead to one of the magnetron's terminals and the other lead to the casing. If meter display indicates that electrical continuity is present between any of the terminals and the casing, the magnetron has shorted and will need to be replaced.
Uncommon But Possible
04 - Frigidaire Microwave High Voltage Transformer
A microwave that is tripping a circuit breaker can be caused by a shorted high voltage transformer. When a high voltage transformer shorts out, it will usually arc and smell burnt.
Uncommon But Possible
Frequently Asked Questions
Why is my Frigidaire microwave tripping the circuit breaker?
How do I test a Frigidaire microwave door switch that may be tripping the breaker?
Can a high-voltage capacitor or magnetron cause my microwave to trip the breaker?
What should I do if my Frigidaire microwave trips the breaker and smells like burning?
How do I find the correct Frigidaire microwave door switch or other replacement part?
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