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HomeRepair HelpHaier Microwave RepairHaier Microwave is tripping circuit breaker Repair
Haier Microwave is tripping circuit breaker
When a Haier microwave is tripping the circuit 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 interlock switches, including the primary door switch, secondary door switch, and monitor switch, which must operate in sequence. A failed switch can short the circuit, blow the line fuse, or cause the microwave to keep tripping the breaker. Test each switch for continuity and replace any switch that fails. If the switches test good, a shorted high-voltage capacitor is the next likely cause. Less common causes include a shorted magnetron or high-voltage transformer. A failed transformer may also arc or produce a burnt smell. These components are inside the cabinet, and the high-voltage capacitor can store a lethal electrical charge even after the microwave is unplugged. Proper capacitor discharge is required before interior work, so use a qualified technician if you are not familiar with the procedure. Enter your Haier microwave model number to find the exact replacement door switch, capacitor, magnetron, or transformer for your appliance.
01 - Haier 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 - Haier 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 - Haier 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 - Haier 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 Haier microwave tripping the breaker?
Can a Haier microwave door switch cause the circuit breaker to trip?
How do I know if the high-voltage capacitor, magnetron, or transformer is shorted?
What should I do if my microwave keeps blowing a fuse or tripping the breaker?
How do I find the correct Haier microwave part for this repair?
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