The short answer
Stop using a High Pointe microwave that arcs, smells of burning or trips a breaker, and unplug it. The first thing to check: circuit overloaded or an extension lead in use. Several of these are recoverable, but none of them are diagnosed by continuing to run the oven.
What you observe
- Bright sparking in the same spot every time — A burnt waveguide cover or carbonised deposits at that spot.
- Sparking only with one particular dish — That dish has metal in it, often a decorative trim.
- NEAR MISS — the oven simply will not heat, with no smell or spark — That is a heating fault without a safety issue. Read the not-heating page for this brand.
Causes, most likely first on a High Pointe microwave
- Circuit overloaded or an extension lead in use — A microwave draws heavily on start. Sharing the circuit with a kettle or running through a thin extension lead can trip a breaker, and that is a supply problem rather than a fault in the oven. The supply here can be shore power, a generator or an inverter, and each behaves differently under load. On this installation the supply explains more faults than the appliance ever does.
- Metal, foil or a trimmed dish in the cavity — Foil, a fork left on a plate, a dish with a metallic band or a twist tie will all arc immediately. The sparking stops the moment the item is removed, which makes it the easiest cause to confirm. A unit fed from a generator or an inverter behaves differently depending on what else is running, so the usage pattern is a real cause rather than a footnote.
- Waveguide cover burnt or soiled — The small cover on the cavity wall protects the opening where energy enters. Splashes soak into it, char, and then arc. It produces dramatic sparking in exactly the same spot every time, and it is the most common cause of arcing. On a factory-fitted installation this ranks behind the supply and the mounting, which is where this complaint resolves far more often than in the appliance.
Check in this order, and why
- Check what else is on the same circuit and whether an extension lead is used — Checked here because it explains a tripping breaker without any arcing at all. It is first because it is the highest-ranked cause here.
- Check what was in the oven when it arced — Second: free, immediate, and it explains a great many one-off events. Second: the next most likely, and free to rule out.
- Look for a small panel on the cavity wall that is scorched or greasy — First, because it is the usual finding and it is visible without tools. Third, and only once the two above are clean.
What an owner can safely check
- Plug the oven directly into a wall outlet and nothing else on that circuit — A microwave really should have an outlet to itself. Reset the breaker once and test.
About 15 min
- Stop the oven, unplug it and let it cool before inspecting anything — Every check on this page is done with the oven unplugged and cold.
About 15 min
- STOP HERE. Do not open the cabinet of a microwave for any reason — The capacitor inside holds a dangerous charge even unplugged. Owner checks end at the cavity.
Before you open anything
Safety
Stop using the oven and unplug it. Never remove the outer cabinet: the high-voltage capacitor inside can hold a lethal charge long after the oven is unplugged. Never run the oven empty, never defeat an interlock, and never continue using an oven that arcs, because each event enlarges the damage. If the smell of burning is coming from the cabinet rather than from food in the cavity, leave it unplugged and have it assessed before it is used again.
When to call a technician
Call when arcing continues after the cavity is clean and the waveguide cover has been inspected, when the burning smell comes from the cabinet, or when the breaker trips as the oven begins to heat. Call immediately, and stop using the oven, if you see flames, smoke or scorching at the plug or outlet. A single arc caused by foil is not a fault; repeated arcing in the same place is damage that grows every time the oven is run.
Nearest pages of this class
What this page does not cover
This page covers High Pointe microwaves as a class, not one family or model line. Where a family- or model-specific page exists for your unit, that page is the more specific answer and the one to read first. Deliberately not here: wiring colours, torque figures, part numbers and service-manual sequences, which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
