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HomeRepair HelpToshiba Microwave RepairToshiba Microwave is tripping circuit breaker Repair
Toshiba Microwave is tripping circuit breaker
If your Toshiba microwave is tripping the circuit breaker, start with the door switches, which are the most likely cause. These switches actuate in sequence when the door closes, and a failed primary, secondary, or monitor switch can make the microwave trip the breaker or blow the line fuse, especially when opening or closing the door. Test each door switch for continuity and replace any switch that fails. If the switches are working, a shorted high-voltage capacitor may be causing the problem. A shorted magnetron is another possible cause, followed by a shorted high-voltage transformer, which may also arc or produce a burnt smell. These high-voltage components are not safe for inexperienced DIY repair. The capacitor stores lethal electrical charge even after the microwave is unplugged, so it must be properly discharged before removing the outer cabinet or testing interior parts. If you are not familiar with capacitor discharge procedures, have a qualified technician handle the repair. Enter your Toshiba microwave model number to find the exact replacement door switch, high-voltage capacitor, magnetron, or transformer for your appliance.
01 - Toshiba 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 - Toshiba 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 - Toshiba 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 - Toshiba 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 Toshiba microwave tripping the breaker when I open the door?
What should I check first when my microwave keeps tripping the breaker?
Can a high-voltage capacitor cause a Toshiba microwave to trip the breaker?
Could the magnetron or high-voltage transformer be causing my microwave to trip the breaker?
How do I find the correct Toshiba microwave breaker or fuse replacement part?
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