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HomeRepair HelpQuasar Microwave RepairQuasar Microwave is tripping circuit breaker Repair
Quasar Microwave is tripping circuit breaker
If your Quasar microwave is tripping the circuit breaker, especially when the door opens or closes, start with the door switches. A failed primary door switch, secondary door switch, or monitor switch can create a short, blow the line fuse, or cause the microwave to trip the breaker. If the door switches test correctly for continuity, the next likely cause is a shorted high-voltage capacitor. Less common causes include a shorted magnetron or high-voltage transformer. A failed transformer often arcs or produces a burnt smell. These faults can make a microwave trip the breaker, keep tripping the breaker, or trip the breaker when opening the door. Testing or replacing a door switch, high-voltage capacitor, magnetron, or high-voltage transformer requires opening the outer cabinet. The high-voltage capacitor can store thousands of volts, including a lethal charge, even after the microwave is unplugged. It must be properly discharged before any interior work, so use a qualified technician if you are not familiar with capacitor discharge procedures. Enter your Quasar microwave model number to find the exact replacement door switch or other part that fits your specific appliance.
01 - Quasar 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 - Quasar 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 - Quasar 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 - Quasar 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 Quasar microwave tripping the circuit breaker when I open or close the door?
What should I check first when my Quasar microwave keeps tripping the breaker?
Can I test a Quasar microwave high-voltage capacitor, magnetron, or transformer with a multimeter?
What should I do if my Quasar microwave trips the breaker and smells burnt or sparks?
How do I find the correct Quasar microwave door switch or capacitor replacement part?
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