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HomeRepair HelpBosch Microwave RepairBosch Microwave is tripping circuit breaker Repair
Bosch Microwave is tripping circuit breaker
When your Bosch microwave is tripping the circuit breaker, the most likely cause is a failed door switch. Most microwaves use three or four interlock switches, including the primary door switch, secondary door switch, and monitor switch, which must close in sequence when the door shuts. A defective switch can short the circuit, blow the line fuse, or trip the breaker. Less common causes include a shorted high-voltage capacitor, shorted magnetron, or shorted high-voltage transformer. A transformer that has failed may also arc or produce a burnt smell. Testing these parts requires a multimeter and access inside the microwave cabinet. Unplug the microwave first, but remember that the high-voltage capacitor can store a lethal charge even after power is disconnected. It must be properly discharged before any interior work, and this repair may require a qualified technician if you are not familiar with capacitor discharge procedures. Enter your Bosch microwave model number to find the exact replacement door switch, high-voltage capacitor, magnetron, or transformer for your appliance. Never bypass a door switch or continue using the microwave if it repeatedly trips the breaker.
01 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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 Bosch microwave tripping the breaker?
Can a Bosch microwave door switch cause the breaker to trip?
Is it safe to test the high-voltage capacitor, magnetron, or transformer?
What should I do if my microwave trips the breaker and smells burnt?
How do I find the correct Bosch microwave replacement part?
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