LG Microwave f3 error code
The microwave detected a fault in the touchpad or control panel area. It is often a short circuit caused by wear, spills on the panel, or a failing temperature sensor.
Also shown as: f3, F3, F-3
Last updated: October 6, 2026
What causes the f3 error?
- Shorted keypad or control panel
- Spills or gunk on the control panel
- Short circuit in internal wiring
- Faulty temperature sensor
- Failed electronic control
How to fix LG f3 — step by step
Work through these in order, from simplest and safest first. Stop as soon as the code clears.
- Power reset the microwave
Unplug the microwave for 3 to 5 minutes, then plug it back in. This clears temporary control glitches. - Photograph the code first
Take a photo of the F3 on the display before resetting. If it returns, you have the exact code to show LG support or a technician. - Clean the control panel
Wipe the panel with a soft, slightly damp cloth to remove grease and residue around the buttons. Check whether any button feels stuck.Safety warning: Unplug the microwave before cleaning around the panel. - Test the buttons
After the reset, press each button once. Dead or unresponsive buttons confirm the keypad is failing.
When to call a technician
- F3 returns immediately after a reset
- Buttons are dead or register wrong inputs
- You smell burning or see sparking
- The control panel needs replacing
Frequently asked questions
Is F3 dangerous?
It signals an electrical fault, so stop using the microwave if you smell burning or see sparking. Otherwise it is a control fault, not a radiation issue.
Will unplugging fix F3?
Sometimes, if it was a glitch. If F3 returns immediately, the keypad, sensor, or control board has genuinely failed.
Can I replace the keypad myself?
It involves opening the microwave near high-voltage parts. Unless you are experienced, leave it to a technician.
Sources
Every meaning and fix above was checked against official manufacturer documentation:
FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.