ErrorCodeDoctor
LG · Microwave

LG Microwave F5 error code

Difficulty: Hard · Cost: $80–$250 · Duration: Requires professional service

The F5 error means your LG microwave has detected a problem with the damper switch — the component that controls the vent damper which opens and closes to manage airflow and steam ventilation inside the microwave cavity. When it fails the microwave cannot manage ventilation correctly. There are no user steps to resolve this error and the unit requires a professional repair service to inspect and replace the faulty damper switch.

Common causes

  • Damper switch has malfunctioned or failed completely
  • Damper mechanism is physically stuck or obstructed
  • Wiring connection to the damper switch is loose or damaged

How to fix it

  1. 1

    Disconnect the microwave from power for about a minute and plug it back in to attempt a reset

  2. 2

    If F5 returns after resetting the damper switch needs inspection and replacement by a qualified technician

Related LG Microwave error codes

1

E10

The control board has detected an internal short circuit

hard
2

F1

A fault was detected in the main control board

hard
3

F2

The thermistor detected that the temperature is out of the safe operating range

hard
4

F3

A fault was detected in the control panel

hard

F5 error — frequently asked questions

What does the F5 error mean on a LG microwave?

The damper switch has detected a fault

What causes the F5 error?

The F5 error is usually caused by: Damper switch has malfunctioned or failed completely; Damper mechanism is physically stuck or obstructed; Wiring connection to the damper switch is loose or damaged.

Can I fix the F5 error myself?

This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.

How much does it cost to fix the F5 error?

Fixing the F5 error on a LG microwave typically costs $80–$250, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my microwave with the F5 error?

We'd recommend addressing the F5 error before continuing to use the microwave, since hard-rated issues often involve a real fault rather than a minor glitch.