---
title: "GE microwave error code F4"
description: "GE microwave error code F4: Open humidity sensor. Which machines can actually raise it, where the number lives on this make, and what to do next."
url: "https://gemiami.support/error-codes/microwave-f4/"
date_modified: "2026-08-31"
Appliance type: "Microwaves"
---


# GE microwave error code F4

### What F4 means, in the maker’s own words

Open humidity sensor. GE’s sensor-cooking features depend on it, so a microwave with this code usually still heats on manual settings and fails only on the automatic ones.

### Where this code actually appears

On the control panel, and usually with a sound. GE describes their refrigerator codes as flashing green on the display and typically accompanied by a beeping, and the range, microwave and dishwasher tables all describe codes you can read from the front of the appliance. That is the opposite of some makes, where the number is written into a hidden log and never shown — here, if something is wrong, the appliance generally tells you. Photograph what it says before cutting the power, because a reset erases it and the code is most of the diagnosis.

### What to do about it

- Test the appliance on a manual time-and-power setting. If that works, the humidity sensing is the whole problem and the repair can be planned rather than rushed.
- Clear power for a minute and restore.
- If it persists, the sensor and its wiring are measured.

### Where this goes next

The job this usually becomes is [microwave repair](/services/microwave-repair/), and every one of those pages carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 306-2503](tel:+13053062503) and describe what the display is doing before booking anything.

What this one means

What F4 means, in the maker’s own words

Open humidity sensor. GE’s sensor-cooking features depend on it, so a microwave with this code usually still heats on manual settings and fails only on the automatic ones.

Where this code actually appears

On the control panel, and usually with a sound. GE describes their refrigerator codes as flashing green on the display and typically accompanied by a beeping, and the range, microwave and dishwasher tables all describe codes you can read from the front of the appliance. That is the opposite of some makes, where the number is written into a hidden log and never shown — here, if something is wrong, the appliance generally tells you. Photograph what it says before cutting the power, because a reset erases it and the code is most of the diagnosis.

What to do about it

Test the appliance on a manual time-and-power setting. If that works, the humidity sensing is the whole problem and the repair can be planned rather than rushed.

Clear power for a minute and restore.

If it persists, the sensor and its wiring are measured.

Where this goes next

The job this usually becomes is microwave repair, and every one of those pages carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 306-2503](tel:+13053062503) and describe what the display is doing before booking anything.

---

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