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A plate of food on the turntable of an open microwave, one half steaming and the other not.

What the microwave is telling you

Common problems
guides.

What a microwave means when the food comes out cold, blue flashes crackle in the cavity, the glass plate stops turning, or it quits halfway through a cycle.

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  • Three guides
  • Read before you book
  • Says where to stop

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Common problems,
guide by guide.

A microwave tends to announce its problems plainly: a snap and a blue flash, a bowl that comes out as cold as it went in, a glass tray that sits still while the timer runs down. The guides in this section each take one of those and trace the symptom back to its likely cause, across the four ways a microwave is installed: the hood combination above the cooking surface, the built-in in a cabinet or trim kit, the drawer under a counter, and the countertop model.

All 18 guides
A stainless microwave hood combination under white wall cabinets in a US home kitchen, a small blue spark visible through the closed microwave door window beside a plain glass dish of green beans on the glass turntable.
5-minute read

Why a microwave sparks: stray metal, a spattered waveguide cover and a scarred cavity

Most arcing starts with a twist tie, a gold rim, a rack in the wrong mode or baked-on spatter over the waveguide; the marks it leaves decide whether the cavity can go on.

A countertop microwave on a quartz counter in a US home kitchen, its door open to show a plain glass bowl of soup and a glass measuring cup of water on the glass turntable, the microwave's display blank.
5-minute read

Microwave runs but food stays cold: settings, the door latch and the high-voltage side

A turning tray and a lit cavity prove nothing about heat. Rule out the timer, demo mode, a low power level and a lazy door close, then let a cup of water decide.

A countertop microwave on a butcher-block counter in a US home kitchen with its side-hinged door open, the glass turntable lifted out and resting beside the microwave next to its roller ring, a plain glass dish waiting on the counter.
5-minute read

Why the turntable stopped: the coupler, the roller ring and the motor beneath

An upside-down tray, a coupler off its shaft, sugar under the wheels or a dish too wide stall more turntables than a dead motor; here is the order to check them in.

What the microwave is telling you.

Many of the answers cost nothing. A twist tie, a rack left in for the wrong mode, a kitchen timer pressed instead of a cook time, a tray washed and put back upside down: not one of these needs a new part, yet each produces a symptom that looks alarming. The guides deal with those first, in the order they turn up in real kitchens.

Each guide also marks the point where checking stops. A microwave's heating circuit runs at high voltage, and the capacitor that feeds the magnetron can keep a dangerous charge after the plug is out, so nothing here asks you to take off the outer cabinet or a control panel. Where the answer is inside, the guide says so and explains what a technician will look at.

Where a maker publishes guidance, we cite it next to the claim it backs: GE Appliances, Sharp, Wolf and the FDA's pages on microwave ovens among them. When makers disagree or say nothing, the guides describe what to look for rather than inventing a rule.

Not sure where to start?

The short answerWhy a microwave sparks: stray metal, a spattered waveguide cover and a scarred cavity

Microwave sparking, which makers call arcing, usually comes from metal in the cavity (twist ties, gold-trimmed dishes, foil edges, a rack or probe used the wrong way), from food residue on the waveguide cover, or from dry vegetables.

The short answerMicrowave runs but food stays cold: settings, the door latch and the high-voltage side

When a microwave runs but does not heat, first confirm it was set to cook rather than to run a kitchen timer, that demo mode and a low power level are off, and that the door was closed firmly.

The short answerWhy the turntable stopped: the coupler, the roller ring and the motor beneath

A microwave turntable not turning is most often a tray that is off its coupler, upside down or riding on a dirty roller ring, a dish too wide to clear the walls, or a turntable switched off on the control.

When reading
is not enough.

If the checks in these guides did not settle it, the visit picks up from there, stop by stop.

What repairs cost
  1. 01A cup of water, timed
  2. 02The price before the work
  3. 03Usual parts on board
  4. 04Heating again before we leave

The problems
these answer.

Each has a page of its own, with the causes in the order worth checking.

All 17 problems
A stainless microwave hood combination mounted under wall cabinets, seen straight on through its closed side-hinged door with a mesh window, one small bright blue spark flashing inside the dim microwave cavity near the side wall beside a plain glass bowl on the glass turntable. Stop using it

Sparks Flashing Inside a Microwave

6 causes, cheapest first

 A built-in stainless microwave set in a tall kitchen cabinet, seen through its closed side-hinged door with a mesh window, grey smoke filling the microwave cavity and a small orange glow on a paper bag on the glass turntable, the door firmly shut. Stop using it

Microwave Fire: Smoke or Flames Behind the Door

6 causes, cheapest first

 A countertop stainless microwave on a kitchen counter, seen through its closed side-hinged door with a mesh window, a thin wisp of haze drifting from the vent slots on its side and a darkened brown patch on the cover panel inside the microwave cavity, a plain glass dish on the glass turntable. Stop using it

Burning Smell From a Microwave

6 causes, cheapest first

 A built-in stainless microwave in a trim kit set into a kitchen cabinet, its side-hinged door with a mesh window open and a plain glass measuring cup of water standing on the glass turntable inside the microwave cavity, the cavity lamp lit, a quiet kitchen around it. Problem

Microwave Runs but Food Stays Cold

7 causes, cheapest first
A family warming plates of food at a built-in microwave in a bright kitchen
For the heart of your home.

Questions about
common problems.

Which microwave problems mean I should stop using it today?
Sparks from an empty cavity, smoke or flame, a burning smell, a breaker that trips when it starts, and any microwave that runs with the door open or has a bent door. Switch it off at the breaker and book a visit.
Is a microwave drawer covered here as well as a door model?
Yes, and each one says where a drawer differs. A drawer has no turntable, its door is motorized and can be locked from the keypad, and its rating plate sits in a different place.
Why do the guides keep mentioning a cup of water?
It is the simplest honest test of whether a microwave heats. One cup, one minute on full power, and your hand tells you whether the heating side is working before anyone discusses parts.
Is a hood combination harder to repair than a countertop model?
It is heavier and hangs on a wall plate, so some repairs mean taking it down with two people. The diagnosis is much the same; the labor around it is what grows.

The other
sections.

Split by what you are trying to find out rather than by which part of the appliance it concerns.

All guides
A finger pressing a key on the touch keypad of a microwave, the display dark.
Checks you can make at the door

Troubleshooting

Two metal grease filters from a microwave hood combination soaking in a sink of warm soapy water.
Habits that keep it heating for years

Maintenance and prevention

A closed microwave with a faint glow behind its mesh window, the kitchen empty and nobody near it.
Keeping people and the kitchen safe

Sparks, fire and the door

A built-in microwave in a tall cabinet and a microwave drawer in the island of one kitchen.
Which kind of microwave, and fix or replace

Choosing and comparing

A metal mounting plate fixed to a kitchen wall under empty wall cabinets, a microwave on the counter below waiting to go up.
Where it goes, how it vents, what it plugs into

Installation and setup

Not sure which section?

Start from your question

The four questions most visits start with, each with the guide that answers it.

18 guidesWhere to start Where to start

Back to your everyday

Let’s get your microwave working again.

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