LG Microwave F4 Error Code

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What it means

The microwave detected a humidity-sensor error.

Try this first

Stop the cooking operation.
Disconnect power.
Do not attempt internal sensor repairs.

Can I keep using it?🔴 Sensor fault

Repair usually required?🔴 Service required

If the error keeps returning

LG identifies F4 as a humidity-sensor error requiring service.

Official source

Troubleshooting information verified against manufacturer support documentation.

View manufacturer support page →

Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.

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LG Microwave F4: Quick Answer

What it means: The microwave detected a humidity-sensor error.

First thing to check

Stop the cooking operation.

Can I keep using it?

Sensor fault

Repair outlook

Service required

If the code remains

LG identifies F4 as a humidity-sensor error requiring service.

Model note: Error-code meanings and procedures can vary by model and model year. Confirm the code against the documentation for your exact appliance before replacing parts.

Manufacturer reference: lg.com