Microwave stopped working after a power outage or a storm

What an outage does to a microwave

A microwave is two machines in one cabinet. The light, the fan, the turntable and the clock run on ordinary house current through the electronics, and a separate high-voltage circuit does the heating. An outage can touch either one, and the second the power returns is often harder on them than the outage itself.

GE and Whirlpool both program their microwaves to report a power failure. Depending on the model, the display can read PF, 888 or 8888 once the power is back, or a colon or PF can flash on an over-the-range model. That code is the control noticing that the power went away. It says nothing about damage, so the useful question is what happens next: whether the microwave heats, whether the code keeps coming back, and whether the display answers at all.

Signs of a real fault

The display stays dark while the rest of the kitchen works. An over-the-range microwave runs on a circuit of its own, so a dark microwave next to working counter outlets points either to the power reaching it or to the electronics inside.

The display is on but frozen, or the keys are ignored. A control that stays that way once the power is steady has usually taken the surge.

The light, the fan and the turntable run, yet food stays cold. The house-current side works and the heating side does not, which is a fault inside the cabinet.

The code keeps coming back. A power failure code that returns again and again, with the power steady, points to the power reaching the microwave or to its electronics.

A breaker that trips again as soon as it is reset. That points to a short. Leave the breaker off and call.

When the fault is inside the cabinet

A microwave that stays dark with power at the outlet, or runs without heating, has a fault inside the cabinet. The FDA requires every microwave oven to have two independent door interlocks and a monitor that stops the oven if they fail, so the parts in there are built to shut it down when something goes wrong, and the right repair depends on why a part failed, not only on which one. The cabinet also holds high voltage that can give a severe, possibly fatal shock even with the microwave unplugged. This is where your part ends and ours begins.

Why storms reach microwaves here

Florida had the highest lightning density of any state in 2025, with 305 lightning events per square mile, according to the lightning network operator Vaisala. In Southwest Florida the rainy season runs from May 15 to October 15, and the National Weather Service lists frequent lightning among its hazards. One of the ways lightning gets into a house is through wires that run outside it, and its surges can damage electronic equipment some distance from the strike.

Hurricanes add long outages and a restart for many homes at once. Ian came ashore on the barrier island of Cayo Costa on September 28, 2022, at Category 4 strength, and at the peak 2.78 million Florida customers were without power at once. During Milton, on the morning of October 10, 2024, LCEC's outage map showed 125,565 customers without power in Lee County, 59.6 percent of its customers there, and 14,335 in Collier County, 36.6 percent. FEMA's guidance on the moment the lights return is direct: power may come back with momentary surges or spikes that can cause damage.

The 2023 Florida Building Code, 8th Edition, adopts the 2020 National Electrical Code. That code requires a Type 1 or Type 2 surge-protective device at the service equipment of a home, for new services and for service upgrades. The National Weather Service still warns that typical surge protectors will not protect equipment from a lightning strike.

When the power goes out, and when it returns

FEMA warns that the power may return with momentary surges that can damage appliances and electronics, which is why so many microwaves here act up the day the lights come back rather than during the outage. While a thunderstorm is still going, the National Weather Service warns against unplugging or switching anything, because of the risk of being struck. In a home that took on water, FPL's advice is to take care with appliances that are still plugged in and never to stand in water while working a switch or a cord.

Leave these to us

• The outer cabinet. The high-voltage parts inside can give a severe, possibly fatal shock, even with the microwave unplugged.

• Parts swapped on a guess. Inside a microwave a part usually fails because something else went wrong first, and a new one put in without finding that cause can fail the same way again.

• A door that does not close firmly. The FDA says not to use a microwave whose door does not close firmly or is bent, warped or otherwise damaged, and to seek help when the hinges, latches or seals are damaged.

What our technician checks

We start at the outlet in the cabinet above and confirm the circuit before anything comes apart. With the high-voltage side made safe, we test the protection circuits, the door safety system, the electronics and, when it does not heat, the heating side, and replace what failed. You hear the price after the diagnosis, before any work starts. The service call fee is waived when you go ahead with the repair.

We repair microwaves across Lee and Collier counties, in the Fort Myers area and the Bonita Springs and Naples area. See appliance repair in Fort Myers and appliance repair in Bonita Springs.

Questions after an outage