Error code reference

LG Refrigerator Error Code F3

Defrosting function is abnormal: defrost heater, thermal fuse open or disconnection (displayed after at least 4 hours from the trouble occurring).

SourceLG Refrigerator GR-349/389SQF - Service Manualp. 19

Diagnostic procedure

The full F3 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check defrost heater and thermal fuse for open circuit or disconnection.

SourceLG Refrigerator GR-349/389SQF - Service Manualp. 19

More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented

18 manuals in the MyPros+ library document this code for LG refrigerator.

Models covered by the manuals that document this code

More models are covered than are listed here.

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