---
title: "Microwave runs but does not heat"
description: "GE microwave runs but does not heat: gE's own list starts with two checks that cost nothing: whether the timer was set instead of a cook function, and…"
url: "https://gemiami.support/symptoms/microwave-not-heating/"
date_modified: "2026-08-31"
Appliance type: "Microwaves"
---


# GE microwave runs but does not heat

### Check the door closes firmly, and that you used a cook function

GE names both first. The door has to engage its safety interlocks before the magnetron will run at all, and a door that looks shut but sits a fraction proud will tumble the plate and heat nothing. The other one is more embarrassing and just as common: the timer counts down without cooking anything.

### The part we would rather nobody opened

A microwave capacitor holds a dangerous charge after the appliance is unplugged, and it does not care how confident anybody is. This is the one category where we would rather a customer called somebody competent than took the case off.

### When it is not worth repairing

A countertop microwave, once the high-voltage side has gone, rarely is. A built-in, a drawer or an over-the-range unit usually is, because replacing it is joinery as well as shopping. We will tell you which you have before quoting.

A GE microwave not heating, with the plate turning and the light on, is usually the high-voltage side — and that is licensed work, because the capacitor holds a charge after the appliance is unplugged.

The timer used instead of a cook function

GE's own first check. The appliance is behaving correctly and doing nothing.

A door not engaging its interlocks

Open it and close it firmly. A worn latch or a dropped door produces this and is a small repair.

The high-voltage side

Magnetron, diode or capacitor. Licensed work, and the reason this symptom gets a visit rather than advice.

The touch panel or a sensor

GE's F3 is a shorted touch pad here — note that on a range the same code means the oven sensor.

Confirm you selected a cook function

Not the timer. It is the first thing GE asks and it is right often enough to ask.

Open the door and close it firmly

Then try again. If it heats, the latch is your repair.

Photograph any code

And check it against the microwave table rather than the range one.

On an over-the-range unit, test the fan and lights separately

They are a different circuit, and a unit where only the fan has died is a much smaller repair.

The plate turns, the light is on, the food is cold

What it usually means

Runs a full cycle, nothing gets warm

The plate turns and the light works

An F code on the display

Check the door closes firmly, and that you used a cook function

GE names both first. The door has to engage its safety interlocks before the magnetron will run at all, and a door that looks shut but sits a fraction proud will tumble the plate and heat nothing. The other one is more embarrassing and just as common: the timer counts down without cooking anything.

The part we would rather nobody opened

A microwave capacitor holds a dangerous charge after the appliance is unplugged, and it does not care how confident anybody is. This is the one category where we would rather a customer called somebody competent than took the case off.

When it is not worth repairing

A countertop microwave, once the high-voltage side has gone, rarely is. A built-in, a drawer or an over-the-range unit usually is, because replacing it is joinery as well as shopping. We will tell you which you have before quoting.

A GE microwave not heating, with the plate turning and the light on, is usually the high-voltage side — and that is licensed work, because the capacitor holds a charge after the appliance is unplugged.

### There are sparks inside.

Stop and unplug it. GE calls that arcing, and running it damages the cavity further every time. A scorched cavity often ends the appliance.

### It shows PF or 888.

That is a power failure notice rather than a problem. Cancel/Off clears it and the appliance works normally.

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