The short answer for EM models
An Avanti EM microwave that trips the circuit as soon as it starts is telling you about a short under load, most often in the high-voltage section. Nothing about that is owner-diagnosable, and repeatedly resetting the breaker to see what happens is the one thing not to do.
What the owner sees
- Visible sparking or arcing inside the cavity — Usually metal in the oven or damaged cavity paint, but it should be treated seriously either way.
- Lights dimming elsewhere in the house when it starts — A heavy load on a circuit that is marginal for it.
- The oven runs but the house RCD trips intermittently — A leakage fault, which needs a technician with the right instrument.
- A hot or acrid smell during or after use — Overheating insulation or a component, and a reason to stop immediately.
- NEAR MISS — food is cold but nothing else is wrong — That is a heating failure and it is not an electrical safety problem.
Likely causes on EM, ordered
- High-voltage component shorted — Ranked first for a breaker that trips under load, because that is the only section of the oven that draws heavily enough to do it.
- Circuit shared with other heavy loads — Nothing is broken; the circuit is simply being asked for more than it has.
- Control board failure — Last on the list, and it rarely presents as a tripped breaker.
- Waveguide cover burnt through — Food residue on the cover chars, then arcs, and it is a known and preventable cause.
The order that saves the most time
- The order, and why it is this one — This order exists because the cheap causes are also the likely ones: one of the four named above can be settled on EM models before a tool comes out.
- Check the waveguide cover for charring — Food residue on the cover chars and then arcs, and it is a preventable failure.
- Look inside the cavity for foil, metal trim or damaged paint — Arcing inside the cavity usually has a visible cause that an owner can identify.
- Look at the flex where it enters the cabinet — Wear at the strain relief is common on any appliance that gets moved and it is dangerous.
Why the case stays on
Safety
Switch the oven off at the socket and unplug it. On a microwave the high-voltage section holds a charge in its capacitor after the power is off, and that charge is lethal. There is no owner-serviceable part inside the case and no safe way to establish that the capacitor has discharged without the right tool.
Models in the EM family
Reference| Model number | Family key |
|---|---|
| EM038K6BA | avanti:microwave:em |
When to call a technician
The line on a microwave is the outer case, and it is absolute. Cleaning, vents, settings, the clock and the child lock are yours; everything else is a service call.
Other EM problems we cover
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
