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Source-backed error-code guide

Reviewed

LG Range F21 / F22 / F24 / F25 Error Code

These codes indicate that the appliance detected a problem in its steam-sensing system. The code does not identify the failed sensor, wiring, plumbing path, or control, so homeowner troubleshooting should stop at normal controls and LG’s reset.

Applies to LG range or oven with supported steam functions

What the appliance detected

Detected condition

LG says F21, F22, F24, and F25 indicate a steam sensor failure.

What may contribute

Possible causes

  • A steam-sensor condition detected during a supported steam function.
  • A temporary electronic condition that clears after a manufacturer-supported reset.
  • A sensor, connection, wiring, steam-system, or control issue requiring model-specific service if the code returns.

Start conservatively

Safe preliminary checks

Work in order and stop whenever a step is not supported by the documentation for your model.

  1. Record the exact steam code

    • Photograph whether F21, F22, F24, or F25 is shown and record the model number and active cooking mode.
    • Let the oven cool before inspecting any user-accessible reservoir or accessory described in the model manual.

  2. Check only user-serviceable steam items

    • If the exact model manual provides a removable water reservoir or user-cleaning procedure, follow only those documented steps.
    • Do not open steam lines, valves, panels, or internal sensor areas.

  3. Use LG’s reset once

    • Turn the range circuit breaker off for 30 seconds and restore power once, as LG directs for these codes.
    • If the code returns, stop repeated resets and request appliance service.

Actions not recommended

  • Do not remove panels, steam lines, valves, or internal sensor components.
  • Do not probe sensor wiring, apply external power, or test live voltage.
  • Do not replace a steam sensor or control board based on the code alone.

When to stop and request service

  • Request appliance service if any of these steam-sensor codes returns after one documented reset.
  • Stop using steam functions for leaking water near electrical areas, sparking, burning odor, or visible damage.
  • Use the exact model manual for reservoir filling, cleaning, and maintenance instructions.

Documented source

Official information reviewed

Our summary is based on manufacturer support material and stays within the limits of that material.

Source reviewed by Appliance Help HQ: September 23, 2026.

Appliance Help HQ is an independent informational site and is not affiliated with or endorsed by LG.

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