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LG Microwave Error Code F-3: Meaning and Fix

F-3
How F-3 appears on a LG microwave display.
Touch control panel for an LG microwave, a part commonly involved in the F-3 code
Sears PartsDirect product image (LG OEM part AGM73551606)

Also shown as: F3

Reading the microwave display

On a microwave the code replaces the clock on the display. Unplug the unit for a minute to see if it clears, and note the code before you do. 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 F-3

How to fix it

  1. Unplug the microwave and wipe the whole touch panel with a soft damp cloth, then dry it completely.
  2. Remove anything resting against the panel, such as stickers or magnets.
  3. Plug the microwave back in after two to three minutes and see whether F-3 clears.
  4. Try a one-minute run with a cup of water to confirm the keys respond.
  5. If F-3 persists, request service; the panel or board needs replacing.

Parts you may need

PartPart no.Buy
Touch control panelAGM73551606Find 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

What does F-3 mean on an LG microwave?

LG describes F-3 as a touch panel error, often from foreign substances near the keys.

Can I fix F-3 myself?

Cleaning and resetting is safe to try. Opening the control panel is a technician job because of the high-voltage parts.

Why does F-3 return?

Moisture or a failing panel overlay can keep re-triggering the fault.

Other LG microwave codes

Touch control panel for an LG microwave, a part commonly involved in the L codeLControl lock indicator

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 LMC1575ST, LMV1680ST, MSER0990S, MH1536GIS, LMV2057ST.