Why does my oven trip the power when I turn it on?

Bake, grill and fan elements are a heating wire packed in mineral insulation inside a metal tube. When a tube splits or blisters, or the insulation breaks down with age, current escapes to the oven's metal body. You may see a crack, bulge or burnt spot, and the trip often happens only when that element is selected, such as on grill but not bake.

The insulation inside an element can also draw in moisture from the air when the oven sits unused for weeks, after a long holiday or in a house that has been empty between tenants. That leakage can trip the safety switch at first use. Don't keep resetting to dry it out: an element that leaks once may keep leaking, and testing tells you which it is.

If it trips the moment the circuit is switched on, or on every setting, the fault may be in the oven's internal wiring, the terminal block where it connects to the house wiring, or the cable behind it, which heat can damage over the years. If a circuit breaker trips rather than a safety switch, think overload or a short, especially where the oven and cooktop share a circuit and both were on. A worn breaker can also trip on its own.

Some older homes have the oven circuit with no safety switch at all, so a leaking element never trips anything. A trip on a newer board is the protection doing its job.

We test the circuit, the connection and the oven's insulation to find where the leak is. If it's the wiring or the connection, we repair and retest it. If it's the oven, an element swap by an appliance technician may fix it. On an older oven with more than one tired element, replacing it can make more sense, and we can disconnect the old oven and connect the new one.