The short answer
On the 26WHS321102-0 microwave this symptom is usually arcing in the cavity, because it is visible, it is alarming and it is the fault that damages the appliance further every time it is allowed to happen. The 26WHS321102-0 family is a single model number, so the parts list behind every check below is unambiguous. That is where this page departs from the brand-generic article: the checks below are ordered for these models rather than for everything the brand sells.
What you observe
- Visible sparks or flashes inside the cavity — Arcing, which damages the machine further every time it happens.
- A burnt smell during or after a cycle — Residue, a waveguide cover or something on the high-voltage side.
- The breaker trips when heating starts — A heavy fault under load, which is technician work without exception.
- The plug is hot while the cord stays cool — The socket is the problem rather than the appliance.
- NEAR MISS — no heat, no smell and nothing has tripped — A cold machine with no electrical symptoms is an output fault and belongs on the not-heating page.
Causes, most likely first on the 26WHS321102-0 family
- Arcing inside the cavity — First on this family. Every additional arc enlarges the damage, which is why this is the one fault to stop using the machine over immediately.
- Line fuse blowing repeatedly — Second on these models. On this appliance a blown fuse usually means the monitor switch acted because the interlocks disagreed, which is a door problem.
- Cord, plug or socket overheating — Third. It is the one cause here that is about the house rather than the appliance.
- High-voltage components failing — Last of the four, and the one to reach for only when the others are clean. A hot electrical smell with a breaker trip when heating starts is the classic presentation, and it means stop rather than investigate.
- Body: A brand-generic article on this symptom starts with the arcing inside the cavity, and so does this one. What changes below it is the order: the line fuse moves up on these models, because a single-model family leaves nothing to average across, so the ranking can follow what this one platform actually does.
Check in this order, and why
- Look inside for burn marks, bare metal or a damaged rack support — Dark scorch spots or bare metal inside the cavity are conclusive and mean the machine should not be run again.
- Note whether the fuse blows when the door is operated or when heating starts — Blowing at the door points at the interlocks; blowing at heating points at the high-voltage side. It follows because it needs no parts and it settles the next branch.
- After a heating cycle, feel the plug and then the cord a hand-width away — A hot plug with a cool cord is the socket; a cord hot along its length is the cord.
Before you open anything
Safety
Unplug the appliance at the first sign of arcing, burning or a tingle, and do not run it again. The high-voltage capacitor inside a microwave oven can hold a lethal charge long after the machine is unplugged: this is the one domestic appliance that should never be opened by an owner, whatever the symptom. A standard household branch circuit is fifteen or twenty amps at one hundred and twenty volts, and this appliance is a heavy load on one.
Models in the 26WHS321102-0 family
Reference| Model number | Family key |
|---|---|
| 26WHS321102-0 | amana:microwave:26whs3211020 |
When to call a technician
Call for every symptom on this page except cleaning the cavity, and keep the machine unplugged while you wait. Call rather than replace a line fuse yourself, since a repeatedly blown fuse is reporting something that has not been found.
Other faults covered for the 26WHS321102-0 family
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