Start here
Short answer: check what is on the seal before suspecting the door. splatter baked onto the sealing surface is the likeliest cause on this oven, and it costs nothing. Damage to the door structure is a different matter entirely, and that oven should not be run.
The symptoms, and the ones that mean something else
- The door drops or hangs low on one side — A hinge that has worn or a fixing that has loosened.
- The oven starts and stops intermittently — An interlock that is making and losing contact as the door moves.
- A visible gap between the door and the frame when closed — Stop using the oven. A door that does not close square is not a door to run.
- NEAR MISS — sparking inside the cavity — Arcing is an electrical-safety complaint and takes precedence: stop the oven and read that page first.
What actually causes this, ranked
- Splatter baked onto the sealing surface — The flat surface around the cavity opening and the matching face on the door are what close the oven. Food splatter and grease build there invisibly, and they hold the door a fraction off the frame — enough to stop the latch pulling home and to leave a visible gap. First, because nothing else on the list explains as many of these calls, and ruling it out costs nothing but a few minutes. A commercial-duty unit sees more cycles in a month than a domestic one sees in a year, so the wear items head the list and the electronics sit well below them.
- The oven not registering that the door is closed — Microwaves use several interlock switches in series, operated by the latch. They must all confirm the door is shut before the oven will run, and they are the single most common electrical failure in the door assembly because they operate on every use. Second on the list — a real suspect, and the next one that can be settled by looking rather than measuring.
- Latch hooks worn or the catch mechanism sticking — A sticking catch produces the intermittent version: the oven runs sometimes and stops mid-cycle other times, which owners read as an electronic fault. This far down the list because it needs the two above ruled out before the evidence for it means anything.
- A door that has been forced or dropped — This is last on the list not because it is unimportant but because it is a decision rather than a repair: a damaged door ends the oven's use until a technician says otherwise. Last, and the reason the order matters: it is the least likely of the four, and the three above are quicker to settle.
Check in this order, and why
- Look along the flat face around the cavity opening with a torch — Baked splatter is often invisible head-on and obvious at an angle. First: the answer here changes everything you do next.
- Note whether the oven stops when the door is nudged while running — That is an interlock losing contact, and it is a technician's job from there. Then this — it is the next cheapest thing that can be wrong.
- Open and close the door slowly and listen for the catch engaging — A catch that clicks reluctantly or needs help is on its way out. Leave this one until the cheap checks are done; it is the slowest of the three.
What you can do yourself
- Dry both faces and close the door slowly, watching how it meets the frame — It should pull itself home without a lift or a push.
About 10 min
- Stop using the oven until the switches are tested — An oven that starts and stops on its own door is not one to keep using.
About 5 min
- Clean the latch area and the catch recess of grease and crumbs — Do this with the oven unplugged; debris in the recess is a common cause of a sticking catch.
Tools: cloth, torchAbout 20 min
- STOP before testing anything electrical with the power on — The checks above are all done cold. A test that needs power applied is a technician test, whatever a video shows.
Before you touch anything
Safety
Before cleaning, unplug the oven at the wall. The cabinet stays on: a microwave capacitor can hold a dangerous charge after the oven is unplugged. Stop using the oven immediately if it arcs, smells of burning, or its door no longer closes square.
When to hand it over
Book a visit when the latch no longer holds, when the oven stops as the door is nudged, or when the door hangs out of square. Never remove the outer cabinet yourself: the capacitor inside can hold a dangerous charge long after the oven is unplugged.
Nearest pages of this class
Scope, and what is missing from it
This is the general page for the class rather than the page for your model. Where a family- or model-specific Koolmore page exists, it is linked here and it is the one to read first. Absent by design: part numbers, torque figures, wiring detail and anything else that differs between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
