The short answer
An oven that trips its breaker is almost always failing on the element side, and the failure is usually visible: elements fail to earth with a flash and a bang, and the mark is on the element itself. That is a real fault and it means the oven stops being used until it is repaired. On the MAS models the terminal block sits behind a rear cover where heat and vibration both reach it, which is why a scorched connection is worth naming as a distinct cause here.
What you are seeing or smelling
- The breaker trips when the oven is switched on or heats — A load-side fault. Do not keep resetting to see whether it holds this time.
- A bang or a flash from inside the cavity — Usually an element failing to earth. It is a definite fault and the oven comes out of use.
- A smell of hot plastic or burning from behind the oven — That points at the terminal block or the supply connection rather than at the cavity, and it is urgent.
- Scorching or discolouration around the rear connection — A loose terminal generates heat. This is one of the few genuinely dangerous faults on a domestic appliance.
- NEAR MISS — No trips or smells, the oven simply does not heat — That is a heating failure with its own page.
What is behind it, ranked
- An element failing to earth — Elements fail by breaking down internally, and the failure often goes to earth with a flash and a bang that trips the breaker instantly. It leads on the MAS models because it is by far the most common reason one of these trips a breaker. The brand-generic page leads with a loose or scorched supply connection; here an element failing to earth takes that place.
- A loose or scorched supply connection — The signs are a hot-plastic smell from the back, discolouration at the connection and sometimes a crackle.
- Moisture or cleaning fluid in an element or connector — It is worth knowing about because it explains a trip that seems to come from nowhere and may not repeat.
Check in this order, and why
- First — look at the elements with the power off and the oven cold — Isolate the oven at the breaker, let it cool and look for a split, a blister or a bright scorch mark. A visible failure answers the question without anything being tested.
- Second — smell and look at the rear connection area — A hot-plastic smell or discolouration behind the oven means a connection is heating. Do not open it: this is the fault that warrants an electrician rather than patience.
- Third — ask what happened just before the first trip — A spill, a self-clean cycle or a thorough cleaning immediately beforehand points at moisture. Leave the oven isolated and dry for a day and see whether the fault survives.
Safety first
Safety
Switch the oven off at its breaker at the first electrical symptom and leave it off. Do not reset a breaker repeatedly to see whether it holds — that is how a fault becomes a fire. Never open the terminal cover at the back: that connection is on a high-current circuit and it is an electrician job. Let the cavity cool completely before looking at anything, and if you smell gas on a gas model, switch nothing, leave the building and call the gas utility or your emergency number from outside.
When this stops being a homeowner job
Book promptly and describe what you found: whether an element is marked, whether there is a smell behind the oven, whether the trip happens with the oven alone. That decides whether an appliance technician or an electrician is the right call.
Other faults on this appliance
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
