LG Microwave F3: Official Meaning and Checks
Direct answer
What F3 means
Official LG material describes F3 as F-3 errors can occur when there are foreign substances around the touch button panel. (On lightwave ovens, errors related to abnormalities start with the letter F and are displayed as a number.) Other errors can indicate symptoms such as defective parts, a short circuit, communication failures, and overcurrent. This…
Before you begin
Safety first
Safety review is complete for the owner-accessible checks shown here. Do not remove panels, bypass controls, or test live circuits.
- Record the complete displayed code and the full model number before clearing the display.
- Disconnect power before touching a user-accessible filter, hose, burner, or electrical connection.
- Stop using the equipment if it leaks, smells burned or of gas, smokes, sparks, or trips a breaker.
Does this guide apply?
- Region
- United States
- Product family
- LG lightwave ovens (also branded Dios lightwave ovens / NeoChef lightwave microwave ovens); the guide states it was created for all models and images or content may differ from the user's product.
- Exact models
- Not listed in the cited source. Confirm the full model in the official manual.
- Scope note
- The cited source scope is LG lightwave ovens (also branded Dios lightwave ovens / NeoChef lightwave microwave ovens); the guide states it was created for all models and images or content may differ from the user's product.. Confirm the complete model number before applying the guidance; an empty model list does not imply all models.
Find the model label and official manual before ordering a part
Common paths to check
These are source-backed possibilities, not probability estimates for your specific unit.
- 01 Official source meaning: F-3 errors can occur when there are foreign substances around the touch button panel. (On lightwave ovens, errors related to abnormalities start with the letter F and are displayed as a number.) Other errors can indicate symptoms such as defective parts, a short circuit, communication failures,…
Decision path
Safe checks, in order
- 1
Confirm code and model scope
Compare the complete display and full model number with the cited manufacturer page or manual before applying any troubleshooting instruction.
Expected: The official source explicitly covers the displayed code and product family.
If not resolved: Contact manufacturer support with the full model and serial number.
- 2
Follow the official owner checks
Wipe off any foreign substances from the touch button panel and check again. If an error is displayed, unplug the electrical cord and plug it back in to check whether the same error reappears.
Expected: Only the user-accessible condition identified by the official source is corrected.
If not resolved: Stop repeated resets and arrange qualified service if the code returns or the source directs service.
Reset and test
- Yes (official: unplug the electrical cord, plug it back in, and retest).
Important: A reset may clear the display but cannot repair the underlying condition; follow only the exact model-specific manufacturer procedure.
Escalation point
Stop and arrange service when
- The code returns after the cited user-accessible checks or the official source directs professional service.
- The equipment leaks, smells burned or of gas, smokes, sparks, overheats, or trips a breaker.
Model-first repair planning
Components that may be involved
The items below describe the documented diagnostic path. They are not a diagnosis and do not identify a compatible replacement part without the complete model and original part number.
- Touch button panel
Official sources
We paraphrase manufacturer material and show the publication scope so you can verify it.
- LG Microwave - Troubleshooting an F3 Error LG · F3 · accessed 2026-08-08
Reviewed by Device Fix Guide · Last source check:
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