F22 Moderate Moderate DIY

LG Oven F22 — Steam sensor short

LG Oven · Error code F22

What F22 Means

Companion code to F21 — the steam thermistor circuit reads shorted. Steam functions are disabled to prevent uncontrolled steam-generator heating.

Symptoms

  • F22 or F-22 on display
  • Steam features unavailable
  • Code returns immediately after entering a steam cycle

Common Causes

1
Shorted steam thermistor

Sensor reads near 0 Ω.

2
Pinched/melted sensor wires

Insulation breakdown near the steam generator shorts the pair.

3
Water intrusion into the connector

Steam leak wet the harness.

4
Main control board input fault

Board reads short with sensor disconnected.

How to Fix It

  1. Power down for 60 seconds and retry.
  2. Disconnect power, unplug the steam thermistor, and measure resistance. Short = replace.
  3. Inspect the harness for melted insulation; replace pigtail if damaged.
  4. Dry any wet connector and verify the steam generator seals are not leaking.
  5. If sensor checks good when isolated but F22 persists, replace the main control board.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement LG oven steam sensor View on Amazon→

More LG Oven Codes

5b 5b — Sabbath Mode active (not a fault) CF1 CF1 — Left-front cooktop sensor open/short CF2 CF2 — Left-rear cooktop sensor open/short CF3 CF3 — Right-front cooktop sensor open/short CF4 CF4 — Right-rear cooktop sensor open/short F1 Range F1 — Upper Oven Thermistor Error

All LG codes → All oven codes →

Verified against manufacturer documentation: lgparts.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.