GE Microwave High-Voltage Capacitor Replacement — What This Part Does
The high-voltage capacitor in your GE microwave stores and releases electrical energy to power the magnetron, the component that generates microwaves to heat your food. It works with the high-voltage transformer and diode to create the voltage needed for cooking. When the capacitor fails or becomes leaky, shorted, or open, the magnetron can’t get the power it needs. You’ll usually notice the microwave runs normally—lights, turntable, and fan all work—but the food stays cold because the heating circuit is broken.
Signs It Needs Replacing
- Microwave runs but won’t heat food The display, turntable, and light all work normally, but nothing gets warm inside because the capacitor can’t support the high-voltage circuit.
- Loud buzzing or humming with no heat You hear the transformer working harder than usual, but the magnetron doesn’t fire because the capacitor has failed open or lost capacitance.
- Sparking or arcing inside the cabinet A shorted capacitor can cause visible sparks near the high-voltage compartment when the microwave is running.
- Burning smell from the back or side A leaky or overheated capacitor can produce a burnt electrical odor during operation.
- Microwave trips the breaker when started A shorted capacitor can draw excessive current and immediately trip your kitchen circuit breaker.
- Intermittent heating that comes and goes The capacitor works sometimes but fails under load, so food heats inconsistently from one cycle to the next.
How to Replace It
- Unplug the microwave from the wall outlet and leave it unplugged for at least five minutes to allow internal components to discharge partially.
- Discharge the capacitor by using an insulated screwdriver or insulated pliers to short the two terminals together, touching both terminals at once until you hear a pop or see a spark (this is normal and safe when done correctly).
- Remove the outer cabinet by unscrewing the screws on the back and sides of the microwave, then lift or slide the cover off to expose the high-voltage compartment.
- Locate the high-voltage capacitor in the compartment and take a photo or note which wire connects to which terminal before you disconnect anything.
- Disconnect the wire leads from the capacitor terminals by pulling the spade connectors straight off.
- Remove the mounting screw or bracket that holds the capacitor in place, then lift the old capacitor out of the microwave.
- Transfer the mounting bracket to the new capacitor if needed, then install the new capacitor in the same position and secure it with the screw.
- Reconnect the wire leads to the correct terminals on the new capacitor, matching the configuration you photographed earlier.
- Slide the outer cabinet back into place and reinstall all screws, then plug the microwave back in and test heating with a cup of water for one minute.
The Part You Need
| Part | Notes |
|---|---|
| GE microwave high-voltage capacitor | Amazon | GE part number WB27X10011 fits many models. Find your exact model and serial number on the label inside the door frame or on the back panel, then cross-reference your model with the capacitor part number on the GE Appliances website or a parts supplier. |
Related Error Codes
If this part is failing you may also see one of these codes:
- Ge Microwave F1 error code
- Ge Microwave F10 error code
- Ge Microwave F2 error code
- Ge Microwave F3 error code
- Ge Microwave F4 error code
- Ge Microwave F5 error code
- Ge Microwave F6 error code
- Ge Microwave Pf error code
When to Call a Pro
High-voltage microwave components store dangerous voltage even when unplugged. If you are not comfortable discharging a capacitor safely or working inside the high-voltage compartment, call an appliance tech. Also call a pro if replacing the capacitor does not restore heating, because the magnetron, high-voltage diode, or transformer may also be faulty and require diagnosis with a multimeter and experience with the high-voltage circuit.