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LG Range Error Code F21: Meaning and Fix

F21
How F21 appears on a LG range display.
Steam sensor for an LG range, a part commonly involved in the F21 code
Sears PartsDirect product image (LG OEM part EBZ37191706)

Also shown as: F22, F24, F25

Reading the range display

On a range or oven the fault appears on the clock or oven display, often with a beep. Press Cancel or Clear once to silence it, and write the code down first. LG codes are short letter pairs; a capital O differs from a zero.

LG appliances show short alphabetic codes (OE, IE, UE on washers, Er plus letters on refrigerators) and, on ThinQ models, a Smart Diagnosis option. LG also builds many Kenmore Elite units. The codes apply to model numbers such as LDF7774ST, LDT5678SS and DLEX3900B; check the label on your unit to confirm yours.

What causes F21

How to fix it

  1. Switch the unit off at the control and try the function again.
  2. If the code comes back, turn the range's circuit breaker off, wait 30 seconds, and switch it back on.
  3. Check that the steam sensor connector is seated, and descale if your model needs it.
  4. Run the function once more and watch whether the code returns.
  5. If the code persists or you cannot perform the check, schedule a repair; most of these faults need a technician.

Parts you may need

PartPart no.Buy
Steam sensorEBZ37191706Find part

Part numbers are OEM references; confirm fit by your model number before ordering. Some links are affiliate links; we may earn a commission at no extra cost to you.

Questions

Which models?

Steam-equipped ranges.

DIY?

Sensor replacement is moderate.

Is F22 the same?

LG lists F22, F24, F25 as steam sensor failures too.

Other LG range codes

Oven temperature sensor for an LG range, a part commonly involved in the F1 codeF1Upper oven thermistor errorTouch panel for an LG range, a part commonly involved in the F3 codeF3Touch pad sensor key errorOven temperature sensor for an LG range, a part commonly involved in the F4 codeF4Lower oven thermistor errorBake element for an LG range, a part commonly involved in the F6 codeF6Upper oven heating errorConvection fan motor for an LG range, a part commonly involved in the F7 codeF7Upper convection fan errorMeat probe for an LG range, a part commonly involved in the F8 codeF8Meat probe error

Sources

Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.

Applies to models including LRE3061ST, LSGL6335F, LSEL6333F, LRG3061ST, LTE4815ST.