The short answer
On the 26WHS321102-0 microwave this symptom is usually the magnetron, because it is the part that actually produces the microwaves and the one whose failure leaves a machine that runs perfectly and heats nothing. The 26WHS321102-0 family is a single model number, so the parts list behind every check below is unambiguous.
What you observe
- The machine runs a full cycle and the food is cold — Everything works except output, which is the defining symptom of this fault.
- A loud hum when heating is called, and still no heat — A change in sound at the moment of heating is diagnostic and worth reporting.
- Heating is weak rather than absent — Partial output points at the supply or at a cutout rather than at a complete failure.
- The machine heats only if the door is pressed firmly — A latch or interlock issue, not an output issue.
- NEAR MISS — the machine does nothing at all when a button is pressed — A dead panel is a power or control fault and belongs on the will-not-start page rather than here.
Causes, most likely first on the 26WHS321102-0 family
- Magnetron failed — First on this family. It is also the part that is not worth replacing on many machines of this size, which is why naming it early matters financially.
- Door interlock preventing the high-voltage circuit — Second on these models. These switches are what stop the machine emitting with the door open, and one that fails open removes heating rather than safety.
- Control board or its relay not energising the heating circuit — Third. It is distinguished from a magnetron failure only by testing, which is why both end at the same place.
- High-voltage transformer failed — Last of the four, and the one to reach for only when the others are clean. A failing transformer often produces a hot electrical smell and a tripping breaker before it stops working entirely.
- Body: A brand-generic article on this symptom starts with the magnetron, and so does this one. What changes below it is the order: the door interlock 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
- Heat a cup of water for a short timed run and feel it — A machine that runs a full cycle with the water still cold has lost its output, and a cup of water is the only test an owner should run.
- Close the door firmly and note whether the behaviour changes — A machine that heats when the door is pressed firmly has a latch or interlock problem rather than an output problem.
- Listen for a relay click at the moment heating should begin — A click with no heat and no hum is different from a loud hum, and the difference is worth reporting.
Before you open anything
Safety
Unplug the appliance before doing anything beyond the checks on this page. The high-voltage capacitor inside a microwave oven can hold a lethal charge long after the machine is unplugged, and discharging it safely is a trained task — this is the one domestic appliance that should never be opened by an owner.
Models in the 26WHS321102-0 family
Reference| Model number | Family key |
|---|---|
| 26WHS321102-0 | amana:microwave:26whs3211020 |
When to call a technician
Call for anything beyond the cup-of-water test and the vent check, because everything else inside this appliance sits behind a capacitor that can kill. Call immediately and stop using the machine if there is arcing, a burning smell or visible damage to the door or its seal.
Other faults covered for the 26WHS321102-0 family
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Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
