What this means on these models
On the Criterion EM microwave family an oven that will not start is nearly always being refused by the door interlock system rather than by a failed control: a microwave will not run unless every interlock reports a closed door. The capacitor holds a lethal charge after the oven is unplugged, which is why almost every internal fault on a microwave is a service call The owner checks below are the door, the lock, the outlet and the settings, and they stop at the case. The spine carries a single model number here.
What this looks like on this platform
- It worked until the door was slammed, then stopped dead — A classic on this appliance: a slammed door can trip the interlock monitor and blow an internal fuse, and the oven goes completely dead.
- It starts only if the door is lifted or pushed as it closes — A worn latch or a dropped door. The interlocks are marginal, and they will stop working entirely rather than getting better.
- It beeps and shows a code or an error indication — Note it before unplugging, because that clears it. Many ovens also have a demonstration or showroom mode that looks exactly like a refusal to cook.
- NEAR MISS: it runs but the food stays cold — That is a heating fault, not a starting fault, and it lives on the high-voltage side. Read the page for an oven that runs without heating.
Causes, most likely first on this platform
- The door interlock system is not being satisfied — First on this appliance and by a long way: the interlocks exist so the oven cannot run with the door open, and a worn latch hook or a dropped door leaves one of them unmade, and the frame itself carries a door seal that works as a quarter-wave choke in the frame rather than as a rubber gasket.
- A child lock, control lock or demo mode is active — Second because it costs nothing: a lock set by a long press, or a demonstration mode left on after a store display, produces an oven that lights up and refuses every cycle.
- The oven is not getting its supply — A dead display is a supply fault until proven otherwise. A standard household branch circuit is rated 15 A or 20 A, and a microwave should be on its own outlet rather than an extension lead.
- An internal fuse has opened, usually after a door fault — Ranked here because it is the consequence of the first cause: when the interlock monitor detects a mis-sequenced door it blows the fuse deliberately, and the oven goes completely dead.
Where to start, and why here
- Open and close the door firmly and try again — Close it squarely rather than quickly. If the oven starts on a deliberate close, the latch or the door alignment is marginal and is the fault. Work down in order rather than jumping to the likeliest cause.
- Look for a lock indicator and clear it — Hold the lock or cancel button for a few seconds. Child lock, control lock and demo mode all present as an oven that refuses to start.
- Check the outlet with something else — Plug a lamp into the same outlet. A dead display with a live outlet is a different fault from a dead outlet, and this test separates them in seconds.
Before you open anything
Safety
Do not remove the outer case. The high-voltage capacitor can hold a lethal charge long after the oven is unplugged, which is why the interlock switches and the internal fuse are a trade job. Never force, tape or otherwise defeat a door latch to make an oven run: the interlocks are what stop it operating with the door open. Never use a microwave with a damaged door, hinge or latch, and do not run it on an extension lead.
Models in the EM family
Reference| Model number | Family key |
|---|---|
| EM044K-P00A0A | criterion:microwave:em |
When this stops being owner work
Where the line falls here is worth stating plainly. The door, the locks, the outlet, a reset and the settings are the owner side. Call once the oven is still refusing with a good outlet and no lock set, because what remains is the interlock switches, the fuse and the board, all inside the case. On a small oven, weigh that repair against replacement before authorising it. On this platform the case stays on: the capacitor inside can hold a lethal charge even unplugged, which is what makes this a trade job rather than a home one.
The rest of this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
