Oster Short circuit or excessive current draw

Microwave trips the household circuit breaker or blows a fuse when starting a cook cycle.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Shorted high-voltage capacitor, Shorted high-voltage diode, Shorted magnetron, Damaged power cord

Safety first: Unplug the microwave. Do not repeatedly reset breakers; this can be dangerous.

Try a different dedicated outlet: Ensure the microwave is on its own circuit, not shared with other high-load appliances.
Inspect power cord: Look for visible damage. If damaged, the cord must be replaced.
If breaker trips immediately on START: A serious internal short is likely. Do not attempt to run the unit again.
Professional service: A technician will test the high-voltage components and replace the faulty part.

Professional Required 5/5

High-Voltage Capacitor

Check Price on Amazon

We may earn a commission from links on this page.